Concrete signature match: Trojan - Appears legitimate but performs malicious actions for 32-bit Windows platform, family AutoInject
Trojan:Win32/AutoInject!rfn is a concrete detection for a highly evasive Trojan leveraging process injection and API hooking. It utilizes various Windows binaries (mshta, regsvr32, rundll32, PowerShell) and persistence mechanisms (scheduled tasks, BITS jobs) to maintain presence, evade detection, and potentially facilitate further malicious activities like remote file operations, data encoding, or system manipulation.
Relevant strings associated with this threat: - !#HSTR:StringCodeForMshta.A!pli (PEHSTR_EXT) - !#HSTR:StringCodeForHooking.C!pli (PEHSTR_EXT) - !#HSTR:StringCodeForHooking.D!pli (PEHSTR_EXT) - !#HSTR:StringCodeForHooking.L!pli (PEHSTR_EXT) - !#HSTR:StringCodeForHooking.O!pli (PEHSTR_EXT) - !#HSTR:StringCodeForRegsvr32.A!pli (PEHSTR_EXT) - !#HSTR:StringCodeForRundll32.A!pli (PEHSTR_EXT) - rundll32 (PEHSTR_EXT) - !#HSTR:StringCodeForBITSJobs.A!pli (PEHSTR_EXT) - !#HSTR:StringCodeForPowerShell.G!pli (PEHSTR_EXT) - !#HSTR:StringCodeForScheduledTask.A!pli (PEHSTR_EXT) - !#HSTR:StringCodeForDataEncoding.D!pli (PEHSTR_EXT) - !#HSTR:StringCodeForHooking.J!pli (PEHSTR_EXT) - !#HSTR:StringCodeForHooking.K!pli (PEHSTR_EXT) - !#HSTR:StringCodeForRemoteFileCopy.B!pli (PEHSTR_EXT) - !#HSTR:ExecutionGuardrails (PEHSTR_EXT) - !#HSTR:StringCodeForFileDeletion.A!pli (PEHSTR_EXT) - !#HSTR:StringCodeForHooking.M!pli (PEHSTR_EXT) - !#HSTR:StringCodeForNetshHelperDLL.A!pli (PEHSTR_EXT) - !#HSTR:StringCodeForRemoteServices.A!pli (PEHSTR_EXT)
efc9bcab4456732390af9dff35484d0de8daee526a2145f6c2ba3506076169a4cc62f25f4c867625f331e093408934f1431d61e07a23918f99255774819b3b12d94360d0d69a8baba73666578b1e7434e5abf36e09ae283661a7e3a5da9d848d2b0bf362ef44ae6c2cc8a859e93211e1c86b5599e0752039b3e69ba400b84b4c3288945bfb12347cde8ecdce3969a0068c423cf93e598adcd7fe6d1b3e8e2152Immediately isolate the infected host and perform a full system scan with updated antivirus/EDR software to remove all detected malicious files and associated artifacts. Review system logs for evidence of persistence mechanisms (e.g., scheduled tasks, modified registry keys) and investigate for lateral movement or data exfiltration.