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.

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.mlwpath: /opt/CAPEv2/storage/binaries/f4c60f9cd48a8567dc68e2ee604f55bc3d5a67230459e787d71c2e615cb7c69dcrc32: 2EAA7AB4md5: def69f039626979d185c4cab463fdda6sha1: dc78ef6ec312df44c03b2f56db3f503c84cc694esha256: f4c60f9cd48a8567dc68e2ee604f55bc3d5a67230459e787d71c2e615cb7c69dsha512: 5fcadff5a9fb245876e40254917bbb8d7e2f2bd4bce98d7dde108eaaa657961b2a2081a856c1a6bbdf10fdb3adb7b7ae7e58014283705e419c36bfb13e72f6b3ssdeep: 6144:S/ZGI9E4wZX4mzfr0Ix/l//v/itjybQUMQ:SbPyZzfIIx/l/H/itj0/MQtype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T1E544BF6BB544A0E6F177C4F87454F18BA91DEC3262A14C17B6C61B0A75B9382FEA031Fsha3_384: 0f31b4843d21858b9a289d3b959f7869c69164d992c264c111fca7c05f4b19eae3e5757aa367e9959ad19ad799d0eae1ep_bytes: 686c2b4000e8f0ffffff000000000000timestamp: 2013-09-25 18:33:56
Version Info:
Translation: 0x0409 0x04b0CompanyName: MaliopersLichersProductName: SaloperdosMuchosFileVersion: 1.00ProductVersion: 1.00InternalName: KilogrammOriginalFilename: 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.