Istbar (PUA) malicious file

The Istbar (PUA) 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 Istbar (PUA) virus can do?

• Behavioural detection: Executable code extraction – unpacking
• A file was accessed within the Public folder.
• Sample contains Overlay data
• Presents an Authenticode digital signature
• Performs HTTP requests potentially not found in PCAP.
• Reads data out of its own binary image
• Drops a binary and executes it
• The binary contains an unknown PE section name indicative of packing
• Authenticode signature is invalid
• Attempts to modify proxy settings
• Deletes executed files from disk
• Touches a file containing cookies, possibly for information gathering
• Yara detections observed in process dumps, payloads or dropped files

How to determine Istbar (PUA)?

File Info:
name: 05A5E104A1A5DDA45CAD.mlw
path: /opt/CAPEv2/storage/binaries/7e65ded45b4c6d27a80933ec11280ea13dc3b71ac914d4058bf9543e1c4213bb
crc32: F222B9E4
md5: 05a5e104a1a5dda45cad6173b8d97e3d
sha1: 519d3dcf0b60e3a1d7aa404e5dbc72b4fafc9fb7
sha256: 7e65ded45b4c6d27a80933ec11280ea13dc3b71ac914d4058bf9543e1c4213bb
sha512: 43004735e96b6d486884ff5eb2495de25b53931e42c7eada45268f475dae24807038f7d3a8faa427ba61d46dc9bba3f4f98db78a648dc2bd463a4e239eb763bf
ssdeep: 49152:m6draIcFGkSHQ/aS0iHSR9NRcTmtyBiKNzVbv4s:ddraIcGa0ZdCytyBiKNzVbn
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T147A533138656E8F4C3E6AEB66E94DCD08B72FF1B18BD5D0D164F8DA85E6A3404C247E0
sha3_384: 57e602a27f9ee5a30b402512217e3bec61ce5f7913880a44537b884711d982f62cf97e5f8b341bb381e3597bf4bb7fcc
ep_bytes: 558bec83c4cc53565733c08945f08945
timestamp: 1992-06-19 22:22:17

Version Info:
Comments:                                                                      
CompanyName: Acro Software Inc.                                          
FileDescription: CutePDF Writer Companion Setup                              
FileVersion: 2.6.1.1             
LegalCopyright:                                                                                                     
Translation: 0x0409 0x04e4

Istbar (PUA) also known as:

How to remove Istbar (PUA)?

• 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.