Backdoor:Win32/Simda!B malicious file

The Backdoor:Win32/Simda!B 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:Win32/Simda!B virus can do?

• Behavioural detection: Executable code extraction – unpacking
• Yara rule detections observed from a process memory dump/dropped files/CAPE
• Creates RWX memory
• A process attempted to delay the analysis task.
• Dynamic (imported) function loading detected
• Performs HTTP requests potentially not found in PCAP.
• Starts servers listening on 0.0.0.0:20017
• Enumerates running processes
• Reads data out of its own binary image
• CAPE extracted potentially suspicious content
• Drops a binary and executes it
• Authenticode signature is invalid
• Deletes its original binary from disk
• Network activity contains more than one unique useragent.
• Fake User-Agent detected
• Installs itself for autorun at Windows startup
• Attempts to modify proxy settings
• Harvests cookies for information gathering

How to determine Backdoor:Win32/Simda!B?

File Info:
name: 4CB78BFE4EE2A0D22C3E.mlw
path: /opt/CAPEv2/storage/binaries/4ad2b53551be9641cca3e2a86b17607e60cdc74ddfd738bc409d4696d23b41db
crc32: E9FA26E4
md5: 4cb78bfe4ee2a0d22c3e5eb563afa6dc
sha1: 81a7b838c9f0d809f7e268d8f4eba2e2a9726150
sha256: 4ad2b53551be9641cca3e2a86b17607e60cdc74ddfd738bc409d4696d23b41db
sha512: 18726f34fa473fc5c7a70549ccd81572f9dddea81566f7e51a31063da89acd3a8f505e758644f86f97ead38601635b6de4680f30697858d143a1c58a5ade979b
ssdeep: 6144:l45rA5FSkJY8R/kpM3kRaWV/wEsNbqw8QlRTFiPurp+EStS3sth:vFSkB/kBubqw8vm+EKS3s
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T1C2747D2AA4508176E0F4223051FA7A6B2DBD2E6443ED28D377646E8D6C742F372391DF
sha3_384: 3709a16adf22111f02ec5a49813475ea27165e01ab9fb1de3007bbafc1ad1d6271d0b880a80bce0a6d1f7c9fdef64383
ep_bytes: 558bec83e4f881ec0c01000053565768
timestamp: 2011-05-26 03:20:41

Version Info:
0: [No Data]

Backdoor:Win32/Simda!B also known as:

How to remove Backdoor:Win32/Simda!B?

• 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.