About “Worm:Win32/Slenfbot!rfn” infection

The Worm:Win32/Slenfbot!rfn is considered dangerous by lots of security experts. When this infection is active, you may notice unwanted processes in Task Manager list. In this case, it is adviced to scan your computer with GridinSoft Anti-Malware.

What Worm:Win32/Slenfbot!rfn virus can do?

• Behavioural detection: Executable code extraction – unpacking
• SetUnhandledExceptionFilter detected (possible anti-debug)
• Yara rule detections observed from a process memory dump/dropped files/CAPE
• Creates RWX memory
• Possible date expiration check, exits too soon after checking local time
• Anomalous file deletion behavior detected (10+)
• A process attempted to delay the analysis task.
• Dynamic (imported) function loading detected
• Enumerates running processes
• Repeatedly searches for a not-found process, may want to run with startbrowser=1 option
• A process created a hidden window
• CAPE extracted potentially suspicious content
• Drops a binary and executes it
• Unconventionial language used in binary resources: Russian
• The binary contains an unknown PE section name indicative of packing
• The binary likely contains encrypted or compressed data.
• The executable is compressed using UPX
• Authenticode signature is invalid
• Deletes its original binary from disk
• Checks for the presence of known windows from debuggers and forensic tools
• Likely virus infection of existing system binary
• Attempts to identify installed analysis tools by a known file location
• Checks the presence of disk drives in the registry, possibly for anti-virtualization
• Creates a copy of itself

How to determine Worm:Win32/Slenfbot!rfn?

File Info:
name: 980D39A3C4309EA41ADD.mlwpath: /opt/CAPEv2/storage/binaries/c1072257b09b261f15d34dbe08c7e6a36bf456a883ddf7787da72c2905c2cb16crc32: 08D342E2md5: 980d39a3c4309ea41add681de36817c1sha1: 29d22b8e506e1db192d419977c642d73fe8bf69bsha256: c1072257b09b261f15d34dbe08c7e6a36bf456a883ddf7787da72c2905c2cb16sha512: 591ea7a937edd074d976623facbf6647d911ea585b6a4522a98194b4e750c6568df885f02f7159650c2b43e67ad2c9bc917789f1cf25952d8a06e9489b6a413cssdeep: 6144:UG54viMzNJ8PZFwewaf2KVuWhYYv2rIQLn3uoD:e/8PZFwewaf2KVr+ez2n+otype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T1FA24120E9B37661FC6E092BE42091C3F694FFC6E527247461278AF4AE1F153463137A6sha3_384: d110fe28833850c5a60adf812f069d4e8720142fb1e09fa41b211b6b0fe328db0cd0d107bb01988895d48fb3f5021e54ep_bytes: 60be15f071008dbeeb1fceff5783cdfftimestamp: 1999-06-06 05:22:03
Version Info:
CompanyName: Tphtnbrf KncvtmxiqFileDescription: Tphtnbrf Tekomdrqry KbqaifcgpFileVersion: 14, 8, 53, 97InternalName: TphtnbrfLegalCopyright: Copyright © Tphtnbrf Kncvtmxiq 2001-2006OriginalFilename: Tphtnbrf.exeProductName: Tphtnbrf Tekomdrqry KbqaifcgpProductVersion: 80, 103, 50, 123Translation: 0x0409 0x04e4

Worm:Win32/Slenfbot!rfn also known as:

How to remove Worm:Win32/Slenfbot!rfn?

• Download and install GridinSoft Anti-Malware.
• Open GridinSoft Anti-Malware and perform a “Standard scan“.
• “Move to quarantine” all items.
• Open “Tools” tab – Press “Reset Browser Settings“.
• Select proper browser and options – Click “Reset”.
• Restart your computer.