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Analysis Report 08042021New-PurchaseOrder.bat
Overview
General Information
| Sample Name: | 08042021New-PurchaseOrder.bat (renamed file extension from bat to exe) |
| Analysis ID: | 383917 |
| MD5: | 27233176a2a979195b01a53ec16c7631 |
| SHA1: | 0ef424d2000f18e6b83473535bf85d22ed9ab79b |
| SHA256: | 397a62fc978f7a97a87caaf9c35e98e4a053de4e786beee73a6c1ac0e99c9fc9 |
| Tags: | AgentTeslabatYahoo |
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Detection
AgentTesla
| Score: | 96 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Found malware configuration
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Yara detected AgentTesla
Adds a directory exclusion to Windows Defender
Hides that the sample has been downloaded from the Internet (zone.identifier)
Hides threads from debuggers
Initial sample is a PE file and has a suspicious name
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)
Binary contains a suspicious time stamp
Checks if the current process is being debugged
Contains capabilities to detect virtual machines
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to dynamically determine API calls
Contains functionality to launch a program with higher privileges
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Creates a window with clipboard capturing capabilities
Detected potential crypto function
Drops PE files
Enables debug privileges
Extensive use of GetProcAddress (often used to hide API calls)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
JA3 SSL client fingerprint seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
One or more processes crash
PE / OLE file has an invalid certificate
PE file contains strange resources
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 code obfuscation techniques (call, push, ret)
Uses insecure TLS / SSL version for HTTPS connection
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Classification
AV Detection: |
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| Found malware configuration |
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| Multi AV Scanner detection for dropped file |
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| Multi AV Scanner detection for submitted file |
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Compliance: |
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| Uses insecure TLS / SSL version for HTTPS connection |
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Networking: |
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| HTTP GET or POST without a user agent |
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| IP address seen in connection with other malware |
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| JA3 SSL client fingerprint seen in connection with other malware |
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| Uses insecure TLS / SSL version for HTTPS connection |
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