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Analysis Report os9TZxfmTZ.exe
Overview
General Information
| Sample Name: | os9TZxfmTZ.exe |
| Analysis ID: | 385246 |
| MD5: | ad0c93b574bb947cff15483eda82811e |
| SHA1: | ad379c5a86bf646c4a079e737a364ab352107e5b |
| SHA256: | bcaac39113bd17158fe86a77328f97e9c3fa14860c9c4449a8ae0768c85243f4 |
| Tags: | exeGuLoader |
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Detection
FormBook GuLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Potential malicious icon found
System process connects to network (likely due to code injection or exploit)
Yara detected FormBook
Yara detected GuLoader
C2 URLs / IPs found in malware configuration
Contains functionality to hide a thread from the debugger
Creates an undocumented autostart registry key
Detected RDTSC dummy instruction sequence (likely for instruction hammering)
Drops PE files with benign system names
Drops executables to the windows directory (C:\Windows) and starts them
Hides threads from debuggers
Installs a global keyboard hook
Machine Learning detection for dropped file
Machine Learning detection for sample
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Modifies the prolog of user mode functions (user mode inline hooks)
Tries to detect Any.run
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected VB6 Downloader Generic
Antivirus or Machine Learning detection for unpacked file
Checks if the current process is being debugged
Contains capabilities to detect virtual machines
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to read the PEB
Creates a DirectInput object (often for capturing keystrokes)
Creates a process in suspended mode (likely to inject code)
Creates files inside the system directory
Deletes files inside the Windows folder
Detected potential crypto function
Dropped file seen in connection with other malware
Drops PE files
Drops PE files to the windows directory (C:\Windows)
Drops files with a non-matching file extension (content does not match file extension)
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found dropped PE file which has not been started or loaded
Found inlined nop instructions (likely shell or obfuscated code)
Found potential string decryption / allocating functions
Installs a global mouse hook
JA3 SSL client fingerprint seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Modifies existing windows services
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
PE file contains an invalid checksum
PE file contains strange resources
Queries disk information (often used 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
Tries to load missing DLLs
Uses 32bit PE files
Uses a known web browser user agent for HTTP communication
Uses code obfuscation techniques (call, push, ret)
Yara signature match
Classification
AV Detection: |
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| Antivirus / Scanner detection for submitted sample |
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| Antivirus detection for dropped file |
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| Found malware configuration |
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| Multi AV Scanner detection for submitted file |
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| Yara detected FormBook |
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| Machine Learning detection for dropped file |
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| Machine Learning detection for sample |
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| Antivirus or Machine Learning detection for unpacked file |
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Compliance: |
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| Uses 32bit PE files |
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| Found inlined nop instructions (likely shell or obfuscated code) |
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Code function: |
0_2_00417143 | |
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0_2_00416130 | |
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0_2_004171D7 | |
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0_2_004179F2 | |
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0_2_00417190 | |
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0_2_0041725A | |
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0_2_004172E5 | |
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| C2 URLs / IPs found in malware configuration |
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| JA3 SSL client fingerprint seen in connection with other malware |
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| Uses a known web browser user agent for HTTP communication |
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29_2_00569F5D | |
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