Malware Analysis Report

2024-11-16 13:36

Sample ID 240528-n7bq9sbd8z
Target ViennaExec.exe
SHA256 c7fc7246d6850f8ea01b150cc6220f8ff4d2b045318176835e6aa832a593317a
Tags
agenttesla xworm evasion keylogger persistence rat spyware stealer trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

c7fc7246d6850f8ea01b150cc6220f8ff4d2b045318176835e6aa832a593317a

Threat Level: Known bad

The file ViennaExec.exe was found to be: Known bad.

Malicious Activity Summary

agenttesla xworm evasion keylogger persistence rat spyware stealer trojan

AgentTesla

Xworm

Detect Xworm Payload

Looks for VirtualBox Guest Additions in registry

AgentTesla payload

Looks for VMWare Tools registry key

Checks computer location settings

Loads dropped DLL

Checks BIOS information in registry

Executes dropped EXE

Maps connected drives based on registry

Adds Run key to start application

Enumerates physical storage devices

Unsigned PE

Uses Task Scheduler COM API

Enumerates system info in registry

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Creates scheduled task(s)

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Suspicious use of FindShellTrayWindow

Delays execution with timeout.exe

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-28 12:01

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-28 12:01

Reported

2024-05-28 12:04

Platform

win10v2004-20240426-en

Max time kernel

148s

Max time network

96s

Command Line

"C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe"

Signatures

AgentTesla

keylogger trojan stealer spyware agenttesla

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Xworm

trojan rat xworm

AgentTesla payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Looks for VirtualBox Guest Additions in registry

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A

Looks for VMWare Tools registry key

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\tt.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\tt.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\tt.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Viena-Exec = "C:\\Users\\Admin\\AppData\\Roaming\\Viena-Exec.exe" C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe N/A

Maps connected drives based on registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Delays execution with timeout.exe

evasion
Description Indicator Process Target
N/A N/A C:\Windows\system32\timeout.exe N/A

Enumerates system info in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS C:\Users\Admin\AppData\Local\Temp\tt.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer C:\Users\Admin\AppData\Local\Temp\tt.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemVersion C:\Users\Admin\AppData\Local\Temp\tt.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\tt.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\tt.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\tt.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\tt.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1908 wrote to memory of 1760 N/A C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe C:\Users\Admin\AppData\Local\Temp\tt.exe
PID 1908 wrote to memory of 1760 N/A C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe C:\Users\Admin\AppData\Local\Temp\tt.exe
PID 1908 wrote to memory of 1760 N/A C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe C:\Users\Admin\AppData\Local\Temp\tt.exe
PID 1908 wrote to memory of 2792 N/A C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe
PID 1908 wrote to memory of 2792 N/A C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe
PID 2792 wrote to memory of 4920 N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe C:\Windows\System32\schtasks.exe
PID 2792 wrote to memory of 4920 N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe C:\Windows\System32\schtasks.exe
PID 2792 wrote to memory of 1268 N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe C:\Windows\System32\schtasks.exe
PID 2792 wrote to memory of 1268 N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe C:\Windows\System32\schtasks.exe
PID 2792 wrote to memory of 3916 N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe C:\Windows\system32\cmd.exe
PID 2792 wrote to memory of 3916 N/A C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe C:\Windows\system32\cmd.exe
PID 3916 wrote to memory of 4648 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe
PID 3916 wrote to memory of 4648 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\timeout.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe

"C:\Users\Admin\AppData\Local\Temp\ViennaExec.exe"

C:\Users\Admin\AppData\Local\Temp\tt.exe

"C:\Users\Admin\AppData\Local\Temp\tt.exe"

C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe

"C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe"

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Viena-Exec" /tr "C:\Users\Admin\AppData\Roaming\Viena-Exec.exe"

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /delete /f /tn "Viena-Exec"

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9579.tmp.bat""

C:\Windows\system32\timeout.exe

timeout 3

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 blood-sticker.gl.at.ply.gg udp
US 147.185.221.19:65461 blood-sticker.gl.at.ply.gg tcp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 19.221.185.147.in-addr.arpa udp
US 147.185.221.19:65461 blood-sticker.gl.at.ply.gg tcp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp

Files

memory/1908-0-0x00007FFFD5833000-0x00007FFFD5835000-memory.dmp

memory/1908-1-0x00000000007D0000-0x00000000008F2000-memory.dmp

memory/1908-2-0x000000001B7F0000-0x000000001B902000-memory.dmp

memory/1908-3-0x00007FFFD5830000-0x00007FFFD62F1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tt.exe

MD5 a78e0eed0519f40f484bb90140094421
SHA1 27bec5491e51282929d231045b3afeb64a6ad870
SHA256 3b19ffaef69c19ce4b3a4a8b94e2117d4437544286009b357661312672a15e3b
SHA512 301c29e12e6ebe37fe266a5e16e3b7d779b22617fc8cc778395bd7024840cfc06024f09b989d93fe5f92f53a62f129bef687b1ff0b8502ff20fb195d8b8ec2e5

memory/1760-21-0x0000000074D6E000-0x0000000074D6F000-memory.dmp

memory/1760-24-0x0000000000F10000-0x0000000000F82000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Viena-Exec.exe

MD5 5eb6e01db54df58a5a7de27e767ffaf5
SHA1 ec26ea621d1ea0058674f7df9dac96c971a92a03
SHA256 3228ad175ceb3ca939cc22560998070a65fe599b0061fc3c597e98988c6bc09f
SHA512 bbabccd56e2694923ab50d10df57a382dafb0a27415af4c698938166512767179a759cacb5e2704ff0e028c37b9cbcb7374719e79386041d31fcc839990927b5

memory/2792-34-0x00007FFFD5833000-0x00007FFFD5835000-memory.dmp

memory/2792-35-0x0000000000920000-0x0000000000930000-memory.dmp

memory/1760-36-0x0000000005F10000-0x00000000064B4000-memory.dmp

memory/1760-37-0x0000000005A00000-0x0000000005A92000-memory.dmp

memory/1908-38-0x00007FFFD5830000-0x00007FFFD62F1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Guna.UI2.dll

MD5 c19e9e6a4bc1b668d19505a0437e7f7e
SHA1 73be712aef4baa6e9dabfc237b5c039f62a847fa
SHA256 9ac8b65e5c13292a8e564187c1e7446adc4230228b669383bd7b07035ab99a82
SHA512 b6cd0af436459f35a97db2d928120c53d3691533b01e4f0e8b382f2bd81d9a9a2c57e5e2aa6ade9d6a1746d5c4b2ef6c88d3a0cf519424b34445d0d30aab61de

memory/1760-42-0x0000000005CC0000-0x0000000005ED4000-memory.dmp

memory/1760-43-0x0000000005EF0000-0x0000000005EFA000-memory.dmp

memory/1760-44-0x0000000005910000-0x0000000005920000-memory.dmp

memory/2792-48-0x000000001B600000-0x000000001B610000-memory.dmp

memory/2792-49-0x000000001C260000-0x000000001C26A000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\tmp9579.tmp.bat

MD5 7040c9e807b95da4512a58ed603a5465
SHA1 72055ef4d675822c7e4a9c8af23c85e2a5908734
SHA256 a8ee16d28c5b468fbd5084baee961ad75d7c4785a234bc481a2c4fe2f0e08702
SHA512 b1a36d5245b6bc47927cb3edd5b5b229b178c4e4a8db11cfbfffb92999a361ce88d7deb3e7eecf8846919cf92141eba47840dd71fbda3c421b877645e1c5dfce

memory/1760-55-0x0000000005910000-0x0000000005920000-memory.dmp