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Sat, Dec 20, 2014 10:46 pm

Malwarebytes Anti-Malware detection for csrss.exe

A user reported that she saw a message on her system, which runs Windows 7 Professional, Friday morning December 19, 2014 indicating that malware had been detected on her system by Malwarebytes Anti-Malware 1px x 1px.

Malwarebytes detected csrss.exe

The file, which Malwarebytes identified as Trojan.Agent, was csrss.exe was located in her %TEMP% directory, i.e., C:\Users\Pamela\AppData\Local\Temp. There is a legitimate Microsoft Windows file named csrss.exe, but that file is located in C:\Windows\System32. The legitimate file on her system is 7,680 bytes in size and has a time stamp of 0/7/13/2009 08:39 PM. When I checked the one Malwarebytes Anti-Malware was identifying as malware, I saw it had the same size and time stamp.

C:\Windows>dir %TEMP%\csrss.exe
 Volume in drive C is OS
 Volume Serial Number is 4445-F6ED

 Directory of C:\Users\Pamela\AppData\Local\Temp

07/13/2009  08:39 PM             7,680 csrss.exe
               1 File(s)          7,680 bytes
               0 Dir(s)  864,839,192,576 bytes free

I uploded the one Malwarebytes Anti-Malware flagged as malicious to Google's VirusTotal site, which analyzes uploaded files with many antivirus programs to determine if they are safe or potentially dangerous. I had the site reanalyze the file, which had been scanned previously. Zero of the fifty-four antivirus programs used by the site to scan the file identified it as malware. The SHA256 hash listed for the file is cb1c6018fc5c15483ac5bb96e5c2e2e115bb0c0e1314837d77201bab37e8c03a - see the report.

I ran a binary file comparison between the two files using the Microsoft Windows fc utility. It found no differences between the two copies of csrss.exe.

C:\Windows>fc /b %TEMP%\csrss.exe c:\windows\system32\csrss.exe
Comparing files C:\USERS\PAMELA\APPDATA\LOCAL\TEMP\csrss.exe and C:\WINDOWS\SYSTEM32\CSRSS.EXE
FC: no differences encountered

I had previously placed md5deep, which can be downloaded from md5deep and hashdeep, and its associated utilities on the system. I used the 64-bit version, since the system was running the 64-bit version of Microsoft Windows 7, of sha256deep to check the SHA-256 hash for the version of the csrss.exe file in C:\Windows\System32. It reported the same SHA-256 hash as VirusTotal listed for the copy of the file I uploaded from the users %TEMP% directory. I also checked the MD5, Tiger, and Whirlpool hashes for both files. For both files the MD5 hash was 60c2862b4bf0fd9f582ef344c2b1ec72 The Tiger hash function yieled a hash of 42e263a5861a1e3b8e411fec97994a32d2cdfc04cf54ab4b for both. The Whirlpool hash was def1e95668f22e06b605093df41d3bb635e7096860bb0adb6c405be49e723fb2497a8a2b64ca5d25519c4ba00c75facb0421bebc4df24f7c9918e0bb85f4c8f4 for both files.

C:\Program Files\Utilities\File\md5deep>sha256deep64 c:\windows\system32\csrss.exe
cb1c6018fc5c15483ac5bb96e5c2e2e115bb0c0e1314837d77201bab37e8c03a c:\windows\system32\csrss.exe

C:\Program Files\Utilities\File\md5deep>sha256deep64 %TEMP%\csrss.exe
cb1c6018fc5c15483ac5bb96e5c2e2e115bb0c0e1314837d77201bab37e8c03a C:\Users\Pamela\AppData\Local\Temp\csrss.exe

C:\Program Files\Utilities\File\md5deep>md5deep64 c:\windows\system32\csrss.exe
60c2862b4bf0fd9f582ef344c2b1ec72 c:\windows\system32\csrss.exe

C:\Program Files\Utilities\File\md5deep>md5deep64 %TEMP%\csrss.exe
60c2862b4bf0fd9f582ef344c2b1ec72 C:\Users\Pamela\AppData\Local\Temp\csrss.exe

C:\Program Files\Utilities\File\md5deep>tigerdeep64 c:\windows\system32\csrss.exe
42e263a5861a1e3b8e411fec97994a32d2cdfc04cf54ab4b c:\windows\system32\csrss.exe

C:\Program Files\Utilities\File\md5deep>tigerdeep64 %TEMP%\csrss.exe
42e263a5861a1e3b8e411fec97994a32d2cdfc04cf54ab4b C:\Users\Pamela\AppData\Local\Temp\csrss.exe

C:\Program Files\Utilities\File\md5deep>whirlpooldeep64 c:\windows\system32\csrss.exe
def1e95668f22e06b605093df41d3bb635e7096860bb0adb6c405be49e723fb2497a8a2b64ca5d25519c4ba00c75facb0421bebc4df24f7c9918e0bb85f4c8f4 c:\windows\system32\csrss.exe

C:\Program Files\Utilities\File\md5deep>whirlpooldeep64 %TEMP%\csrss.exe
def1e95668f22e06b605093df41d3bb635e7096860bb0adb6c405be49e723fb2497a8a2b64ca5d25519c4ba00c75facb0421bebc4df24f7c9918e0bb85f4c8f4 C:\Users\Pamela\AppData\Local\
Temp\csrss.exe

So I've no reason to suspect that the file in the %TEMP% directory is any different than the one in the C:\Windows\Temp directory. I thought that perhaps the only reason Malwarebytes Anti-Malware flagged it to be quarantined is that it was an exe file in the user's AppData\Local\Temp directory. It is possible that I copied the file there previously when I was checking on various files on the system when trying to eliminate a source of malware infection on the system and that an update to Malwarebytes Anti-Malware now has it mark any file in that directory as malware. I had Malwarebytes Anti-Malware quarantine the file and then copied another legitimate Microsoft Windows exe file, write.exe and also the csrss.exe file from \C:\Windows\System32 into that directory just to see if Malwarebytes Anti-Malware would flag them as malicious. It again detected csrss.exe as malicious, but did not report the write.exe file I copied into that directory from C:\Windows\system32 as malicious, so it doesn't seem to be judging all .exe files in that folder as potential threats, just certain ones.

[/security/antivirus/Malwarebytes] permanent link

Sat, Dec 20, 2014 9:13 pm

Seagate external USB drive part number 9SF2A4-500

I have a Power Adapters page where I list the power adapters that are needed for various devices. I started the page years ago after repeated instances where I had to figure out what power adapter went with what device when an adapter got disassociated from a device and either lost or jumbled with other adapters. To make it easier for me to immediately associate an adapter with a device, I listed the model/part number for a device and the model/part number for its power adapter. I also list, when I can find a source, a site where a suitable replacement adapter can be purchased. Now, whenever I encounter a device, I try to immediately enter the power adapter information for it on my web page. But today, I found a couple of power adapters next to a couple of devices that I had jumbled together. And when I checked my web page I found that I hadn't entered the power adapter information for either device. I was fairly certain that I could associate the right adapter with each advice, assuming that since the adapters were near the devices that they were indeed the ones that went with those devices, but while double-checking on the adapter for a Seagate USB external drive with part number 9SF2A4-500, I came across Felix's Blog, a blog from another person providing tech support, by Marcel "Felix" Giannelia of Terrace, BC, Canada who provides Disassembly instructions for Seagate 1 TB Expansion External Drive (9SE2A4-571 or 9SF2A4-500). I've copied his instructions to my own site here, so that I have a copy should the author's site, or even just these instructions, disappear, since he states at Welcome to Felix's little Knowledge Base thing that "I've been even sloppier about copyright in the files I've written myself. I intend the ones I wrote myself to be in the public domain." According to his disassembly instructions, the drive inside the Seagate External Expansion case is a Seagate Barracuda 7200.12 model ST31000528AS ST31000528AS 1px x 1px.

Checking other postings's to the author's site, I found "Do NOT paraphrase when calling tech support", which links to an email he sent to a user regarding the user's paraphrasing an error message for the Eudora email client, a program I once used many years ago and which users I supported once used. I can certainly emphasize with his posting; many years ago when I was a sysadmin for a Digital Equipment Corporation (DEC) VMS system, a user contacted me about a problem with one of her databases on the system. She gave me the error message and, since DEC very nicely provided documentation for the database software listing possible error messages and steps to take to rectify the problem associated with a particular error message, I referred to that documenation and found it listed an error message that was a very close match to the one the user gave me. After spending a couple of hours checking all of the possibilities listed for that error message, I contacted the user and had her recreate the problem. When she then read me the exact error message, I realized it was quite different than what she had paraphrased from memory previously. Once I had the exact error message, it only took me a few minutes to fix the problem, but I had wasted hours on the problem before that because she hadn't written down the exact message, but gave me a paraphrased version. One user takes snapshots of error messages on her computer screen with her phone now and sends them to me; that's very helpful, since I can see the window containing the error message and its exact contents.

I also found his "Why cats save humans from house fires" amusing, though the smoke alarm has almost never gone off in our house due to food preparation. It did go off one time when I put the tea kettle on the stove to heat water for tea and then went into another room to work on a computer. I didn't hear the tea kettle whistling; when the smoke alarm went off I went into the kitchen and found that all of the water in the tea kettle had boiled off and there was a burning puddle of plastic next to the tea kettle due to the plastic on the handle melting. Our cats didn't like the blaring smoke alarms throughout the house.

In another posting by Felix, I found an adapter that will also be useful to me, since it supports both IDE, aka PATA, drives as well as SATA hard disk drives listed in his a "Product Plug!" posting for a "Ultra USB 2.0 to IDE/SATA Cable for 2.5-Inch/ 3.5-Inch / 5.25-Inch Drive with Power Adapter", which he notes is a "a USB to any-kind-of-hard-drive adapter. That is, it's got a USB plug on one end, and all the kinds of hard drive connector mashed together on the other end. I just ordered one, because this is going to save me so much time disassembling USB enclosures". His link was to the ULT40112 on the TigerDirect.ca site, i.e., the Canadian site for TigerDirect; it is available in the U.S. from TigerDirect.com. I have devices that provide USB connectivity for hard drives that aren't in an enclosure, but none that support both IDE, aka PATA, and SATA drives.

Unfortunately, the plug on the Asian Power Devices WA-24E12 (output 12V 2A) power adapter I found near the drive that I thought went with the drive would not plug into the drive, even though according to information I found elsewhere online it should have worked for that drive. Another 12V 2A adapter, model ADS-24F-12 1224GPCU, I tried from another Seagate external USB disk drive enclosure did connect easily, though.

Seagate® Expansion™ External Data Sheet PDF icon

[/hardware/storage/Seagate] permanent link

Sat, Dec 20, 2014 5:38 pm

Checking the warranty on a Segate drive

If you want to check whether a Seagate disk drive is still under warranty, you can do so at either the Warranty Validation or the Customer Returns page. You can check the warranty for an internal hard disk drive or an external USB drive.

You will need to complete fields on the form for the following information:

If the warranty is expired, you will see "Warranty is expired for the entered Product/Serial". You won't see the date that the warranty expired on.

[/hardware/storage/Seagate] permanent link

Sat, Dec 20, 2014 1:58 pm

Viewing history of DNS server and IP Changes for a Domain

If you wish to view a history of Domain Name System (DNS) server changes for a domain name, you can do so through the WhoISrequest Domain History Checker, which tracks nameserver changes since 2002 for all COM, NET, ORG, INFO, BIZ and US domains.

E.g., if I put sailormoonworld.com, which was registered in 1998, in the search field, I can see a list of all of the DNS servers that translated the fully qualified domain name (FQDN) to an IP address since WhoISrequest began tracking name server changes in 2002. The history information for that particular domain shows that registration for the domain name lapsed in 2013 and the domain name was picked up by a domain name squatter then. The domain name squatter let the domain registration lapse in the summer of 2014. I re-registered the domain name for the original owner, a family member, in October.

You can also view such information through the DNS History site, which notes "Here at DNS History we have been crawling DNS records since 2009, our index currently contains over 200 million domains and discovering over a billion DNS records."

If I put sailormoonworld.com in the Doman Search field on that site, though, it does not have any information on it, though it does have information on moonpoint.com, though that information was last updated on 2010-08-11, so that site's information does not appear to be as comprehensive nor as up-to-date as the information provided through the WhoISRequest site.

You can also find past name server and registration information through the who.is Search Domain DNS and Name Server Information page. When you put a domain name in the search field, and click on "Search DNS and Name Servers", you will see information on the domain, such as name servers, SOA record, DNS records, including the mail exchanger (MX) servers for the domain. If you click on the History tab above that information, you will see past domain name registrars and name servers associated with the domain.

If you wish to see prior IP addresses associated with a domain name, you can use ViewDNSInfo IP History. I noticed when I checked sailormoonworld.com with its tool, though, that it is not showing a change made near the end of October for that domain. The last change it shows was for 2014-07-05. The site also has a lot of other tools, e.g. Google Pagerank Checker, etc.

[/network/dns] permanent link

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