What is “Backdoor.RAT.MSIL.Orcus”?

The Backdoor.RAT.MSIL.Orcus 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.

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What Backdoor.RAT.MSIL.Orcus virus can do?

• SetUnhandledExceptionFilter detected (possible anti-debug)
• Behavioural detection: Executable code extraction – unpacking
• Attempts to connect to a dead IP:Port (2 unique times)
• 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+)
• Guard pages use detected – possible anti-debugging.
• Dynamic (imported) function loading detected
• At least one IP Address, Domain, or File Name was found in a crypto call
• Reads data out of its own binary image
• CAPE extracted potentially suspicious content
• The binary contains an unknown PE section name indicative of packing
• The binary likely contains encrypted or compressed data.
• .NET file is packed/obfuscated with SmartAssembly
• Authenticode signature is invalid
• Anomalous .NET characteristics
• Uses Windows utilities for basic functionality
• Behavioural detection: Injection (Process Hollowing)
• Executed a process and injected code into it, probably while unpacking
• Behavioural detection: Injection (inter-process)
• Behavioural detection: Injection with CreateRemoteThread in a remote process
• Created a process from a suspicious location
• Collects and encrypts information about the computer likely to send to C2 server
• Detects OrcusRAT Behavior
• CAPE detected the OrcusRAT malware family
• Attempts to masquerade or mimic a legitimate process or file name
• Uses csc.exe C# compiler to build and execute code
• Uses suspicious command line tools or Windows utilities

Related domains:

How to determine Backdoor.RAT.MSIL.Orcus?

File Info:
name: 4D6EE916502D64004F5F.mlw
path: /opt/CAPEv2/storage/binaries/19d3b6953a292f714689c66ea44c84bebfcb6a176dc0025a0becebefb80f558a
crc32: 9ACB79AE
md5: 4d6ee916502d64004f5ff45e434d5323
sha1: 39d92eab7a7d5bcf19063b338e63b02d98c4fb6e
sha256: 19d3b6953a292f714689c66ea44c84bebfcb6a176dc0025a0becebefb80f558a
sha512: a4f696f70535b709d7fc35b22784e59e1b421e02df057145d6db49d4a1cc2684e5704c1c657923031220a33cd26c06541d84c8e38351ec878993dab587e324ab
ssdeep: 24576:cy8LwNOPa5kOvLmhNITdN3XXKqZkA8gsPB:ctLwN5nKhN8dN3nxZHsp
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T17345F0E1B748CD62C46B4679903BD6532723AA0D8D1AD60E3CC5BF5E3DA638B041788F
sha3_384: 60a18d7949025cd1da32018c3916f90d0cd08653e28b66d04f42c25f0d3e1082f2240522e07ca4cb670199be9c3533ba
ep_bytes: ff250020400000000000000000000000
timestamp: 2019-04-08 18:22:06

Version Info:
Translation: 0x0000 0x04b0
FileDescription:  
FileVersion: 0.0.0.0
InternalName: s01v1.exe
LegalCopyright:  
OriginalFilename: s01v1.exe
ProductVersion: 0.0.0.0
Assembly Version: 0.0.0.0

Backdoor.RAT.MSIL.Orcus also known as:

How to remove Backdoor.RAT.MSIL.Orcus?

• 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.