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Analysis Report purchase items.exe

Overview

General Information

Sample Name:purchase items.exe
Analysis ID:255486
MD5:327559d02c47e83c76176801e5d61e82
SHA1:cdf282cfc1551e3833bc373f4d856921b89d2f3b
SHA256:929b3de95bbd633a33db18a4099536fb5e22698d59ebe9588eb927f0aaef01da

Most interesting Screenshot:

Detection

AgentTesla
Score:100
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Found malware configuration
Sigma detected: Scheduled temp file as task from temp location
Yara detected AgentTesla
Yara detected AntiVM_3
Contains functionality to register a low level keyboard hook
Hides that the sample has been downloaded from the Internet (zone.identifier)
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Installs a global keyboard hook
Machine Learning detection for dropped file
Machine Learning detection for sample
Queries sensitive BIOS Information (via WMI, Win32_Bios & Win32_BaseBoard, often done to detect virtual machines)
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal ftp login credentials
Tries to steal Mail credentials (via file access)
Uses schtasks.exe or at.exe to add and modify task schedules
Checks if the current process is being debugged
Contains capabilities to detect virtual machines
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains long sleeps (>= 3 min)
Creates a DirectInput object (often for capturing keystrokes)
Creates a process in suspended mode (likely to inject code)
Creates a window with clipboard capturing capabilities
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Drops PE files
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
May sleep (evasive loops) to hinder dynamic analysis
Queries sensitive processor information (via WMI, Win32_Processor, often done to detect virtual machines)
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Uses SMTP (mail sending)
Uses code obfuscation techniques (call, push, ret)
Yara detected Credential Stealer
Yara signature match

Classification

Startup

  • System is w10x64
  • purchase items.exe (PID: 6980 cmdline: 'C:\Users\user\Desktop\purchase items.exe' MD5: 327559D02C47E83C76176801E5D61E82)
    • schtasks.exe (PID: 3540 cmdline: 'C:\Windows\System32\schtasks.exe' /Create /TN 'Updates\&startupname&' /XML 'C:\Users\user\AppData\Local\Temp\tmpEF29.tmp' MD5: 15FF7D8324231381BAD48A052F85DF04)
      • conhost.exe (PID: 5716 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • Appnew.exe (PID: 1448 cmdline: 'C:\Users\user\AppData\Roaming\Appnew\Appnew.exe' MD5: 327559D02C47E83C76176801E5D61E82)
    • Appnew.exe (PID: 5760 cmdline: {path} MD5: 327559D02C47E83C76176801E5D61E82)
    • Appnew.exe (PID: 6628 cmdline: {path} MD5: 327559D02C47E83C76176801E5D61E82)
  • Appnew.exe (PID: 6592 cmdline: 'C:\Users\user\AppData\Roaming\Appnew\Appnew.exe' MD5: 327559D02C47E83C76176801E5D61E82)
    • Appnew.exe (PID: 4596 cmdline: {path} MD5: 327559D02C47E83C76176801E5D61E82)
  • cleanup

Malware Configuration

Threatname: Agenttesla

{"Username: ": "DvCS7dfqAK", "URL: ": "https://WYzEId2qJbrvDkvsdRN4.net", "To: ": "", "ByHost: ": "mail.tsa.ae:587", "Password: ": "W7aMo", "From: ": ""}

Yara Overview

Initial Sample

SourceRuleDescriptionAuthorStrings
purchase items.exeSUSP_Reversed_Base64_Encoded_EXEDetects an base64 encoded executable with reversed charactersFlorian Roth
  • 0xfe8d:$sh3: uUGZv1GIT9ERg4Wag4WdyBSZiBCdv5mbhNGItFmcn9mcwBycphGV

Dropped Files

SourceRuleDescriptionAuthorStrings
C:\Users\user\AppDat