Trojan:Win32/Ymacco.AB3A (file analysis)

The Trojan:Win32/Ymacco.AB3A 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 Trojan:Win32/Ymacco.AB3A virus can do?

• Executable code extraction
• Injection (inter-process)
• Injection (Process Hollowing)
• Injection with CreateRemoteThread in a remote process
• Creates RWX memory
• Possible date expiration check, exits too soon after checking local time
• Mimics the system’s user agent string for its own requests
• Detected script timer window indicative of sleep style evasion
• A process attempted to delay the analysis task.
• Repeatedly searches for a not-found process, may want to run with startbrowser=1 option
• Reads data out of its own binary image
• A process created a hidden window
• Drops a binary and executes it
• A scripting utility was executed
• Uses Windows utilities for basic functionality
• Executed a process and injected code into it, probably while unpacking
• Detects Bitdefender Antivirus through the presence of a library
• Detects the presence of Wine emulator via function name
• Enumerates services, possibly for anti-virtualization
• Attempts to remove evidence of file being downloaded from the Internet
• Tries to unhook or modify Windows functions monitored by Cuckoo
• Attempts to repeatedly call a single API many times in order to delay analysis time
• Exhibits behavior characteristics of BetaBot / Neurevt malware
• A system process is generating network traffic likely as a result of process injection
• Creates a hidden or system file
• Attempts to identify installed analysis tools by a known file location
• Attempts to identify installed AV products by registry key
• Checks the version of Bios, possibly for anti-virtualization
• Checks the CPU name from registry, possibly for anti-virtualization
• Detects VirtualBox through the presence of a device
• Detects VirtualBox through the presence of a file
• Detects VMware through the presence of a device
• Detects VMware through the presence of a file
• Detects VMware through the presence of a registry key
• Attempts to modify browser security settings
• Operates on local firewall’s policies and settings
• Attempts to disable browser security warnings
• Collects information to fingerprint the system
• Uses suspicious command line tools or Windows utilities

Related domains:

How to determine Trojan:Win32/Ymacco.AB3A?

File Info:
crc32: 0F23391Emd5: f7e4a28f1ed37123d6e0851e573cd640name: F7E4A28F1ED37123D6E0851E573CD640.mlwsha1: 8068ea253bafbdbdf2647f264d5a8d5405e8772csha256: 3a2c441a96936c089c1444f4cd50436593fcd43a18c80a1699fc6b2d62dd6907sha512: 5a370cb4c0e592141dea9c6b2494548105ad108666353f383e06253171df988781dab6c19bebafb5d1107348ffec92cd329cad4aef02ad974eda258b0d4f531dssdeep: 49152:DzOJB5ZJBK7/stk6SY6stAHzUfj7a3MTP4f2vcZvExkrK2m/:DKBtKzatHa4k2MpG/type: PE32 executable (GUI) Intel 80386, for MS Windows
Version Info:
LegalCopyright: xa9 xa9 Microsoft Corporatiokn. All rights rekservedFileVersion: 8.00.4900.1912CompanyName: xa9 Microsoft Corporatiokn. All rights rekservedComments: This installation was built with Actual Installer: http://www.actualinstaller.comProductName: Microsoft CorporationProductVersion: 8.00.4900.1912FileDescription: Microsoft Corporation InstallationTranslation: 0x0409 0x04e4

Trojan:Win32/Ymacco.AB3A also known as:

How to remove Trojan:Win32/Ymacco.AB3A?

• 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.