TrojanDropper:Win32/Sirefef removal tips

The TrojanDropper:Win32/Sirefef 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 TrojanDropper:Win32/Sirefef virus can do?

• Behavioural detection: Executable code extraction – unpacking
• Sample contains Overlay data
• Uses Windows utilities for basic functionality
• Reads data out of its own binary image
• CAPE extracted potentially suspicious content
• Authenticode signature is invalid
• Uses Windows utilities to create a scheduled task
• Behavioural detection: Injection (Process Hollowing)
• Behavioural detection: Injection (inter-process)
• Attempts to modify browser security settings
• Creates a copy of itself
• Attempts to disable browser security warnings
• Anomalous binary characteristics
• Uses suspicious command line tools or Windows utilities
• Yara detections observed in process dumps, payloads or dropped files

How to determine TrojanDropper:Win32/Sirefef?

File Info:
name: DEF69F039626979D185C.mlw
path: /opt/CAPEv2/storage/binaries/f4c60f9cd48a8567dc68e2ee604f55bc3d5a67230459e787d71c2e615cb7c69d
crc32: 2EAA7AB4
md5: def69f039626979d185c4cab463fdda6
sha1: dc78ef6ec312df44c03b2f56db3f503c84cc694e
sha256: f4c60f9cd48a8567dc68e2ee604f55bc3d5a67230459e787d71c2e615cb7c69d
sha512: 5fcadff5a9fb245876e40254917bbb8d7e2f2bd4bce98d7dde108eaaa657961b2a2081a856c1a6bbdf10fdb3adb7b7ae7e58014283705e419c36bfb13e72f6b3
ssdeep: 6144:S/ZGI9E4wZX4mzfr0Ix/l//v/itjybQUMQ:SbPyZzfIIx/l/H/itj0/MQ
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T1E544BF6BB544A0E6F177C4F87454F18BA91DEC3262A14C17B6C61B0A75B9382FEA031F
sha3_384: 0f31b4843d21858b9a289d3b959f7869c69164d992c264c111fca7c05f4b19eae3e5757aa367e9959ad19ad799d0eae1
ep_bytes: 686c2b4000e8f0ffffff000000000000
timestamp: 2013-09-25 18:33:56

Version Info:
Translation: 0x0409 0x04b0
CompanyName: MaliopersLichers
ProductName: SaloperdosMuchos
FileVersion: 1.00
ProductVersion: 1.00
InternalName: Kilogramm
OriginalFilename: Kilogramm.exe

TrojanDropper:Win32/Sirefef also known as:

How to remove TrojanDropper:Win32/Sirefef?

• 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.