Malware Analysis Report

2025-06-16 03:09

Sample ID 210803-q18mx2q74e
Target test (1).exe
SHA256 731510ac6a3fd904623344634cb32e9b58bf10b870a4755e255586880f3a0474
Tags
oski infostealer spyware suricata
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

731510ac6a3fd904623344634cb32e9b58bf10b870a4755e255586880f3a0474

Threat Level: Known bad

The file test (1).exe was found to be: Known bad.

Malicious Activity Summary

oski infostealer spyware suricata

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

Oski

suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

Downloads MZ/PE file

Loads dropped DLL

Uses the VBS compiler for execution

Accesses cryptocurrency files/wallets, possible credential harvesting

Suspicious use of SetThreadContext

Kills process with taskkill

Suspicious use of AdjustPrivilegeToken

Checks processor information in registry

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2021-08-03 22:30

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2021-08-03 22:30

Reported

2021-08-03 22:33

Platform

win7v20210410

Max time kernel

35s

Max time network

75s

Command Line

"C:\Users\Admin\AppData\Local\Temp\test (1).exe"

Signatures

Oski

infostealer oski

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

suricata

suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

suricata

Downloads MZ/PE file

Uses the VBS compiler for execution

Accesses cryptocurrency files/wallets, possible credential harvesting

spyware

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1084 set thread context of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe N/A

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 1084 wrote to memory of 288 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 288 wrote to memory of 284 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe C:\Windows\SysWOW64\cmd.exe
PID 288 wrote to memory of 284 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe C:\Windows\SysWOW64\cmd.exe
PID 288 wrote to memory of 284 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe C:\Windows\SysWOW64\cmd.exe
PID 288 wrote to memory of 284 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe C:\Windows\SysWOW64\cmd.exe
PID 284 wrote to memory of 1068 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 284 wrote to memory of 1068 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 284 wrote to memory of 1068 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 284 wrote to memory of 1068 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe

Processes

C:\Users\Admin\AppData\Local\Temp\test (1).exe

"C:\Users\Admin\AppData\Local\Temp\test (1).exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe

"\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c taskkill /pid 288 & erase C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe & RD /S /Q C:\\ProgramData\\622501050453076\\* & exit

C:\Windows\SysWOW64\taskkill.exe

taskkill /pid 288

Network

Country Destination Domain Proto
N/A 162.159.133.233:443 tcp
N/A 8.8.8.8:53 cdn.discordapp.com udp
N/A 162.159.134.233:443 cdn.discordapp.com tcp
N/A 8.8.8.8:53 notedemo.axfree.com udp
N/A 144.76.115.36:80 notedemo.axfree.com tcp
N/A 2.21.41.70:80 tcp

Files

memory/1084-59-0x0000000001380000-0x0000000001381000-memory.dmp

memory/1084-61-0x00000000752F1000-0x00000000752F3000-memory.dmp

memory/1084-62-0x00000000003B0000-0x00000000003B1000-memory.dmp

memory/1084-63-0x0000000000440000-0x0000000000445000-memory.dmp

memory/288-64-0x0000000000400000-0x0000000000438000-memory.dmp

memory/288-65-0x000000000040717B-mapping.dmp

memory/288-67-0x0000000000400000-0x0000000000438000-memory.dmp

\ProgramData\sqlite3.dll

MD5 e477a96c8f2b18d6b5c27bde49c990bf
SHA1 e980c9bf41330d1e5bd04556db4646a0210f7409
SHA256 16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512 335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

\ProgramData\nss3.dll

MD5 bfac4e3c5908856ba17d41edcd455a51
SHA1 8eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256 e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA512 2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

\ProgramData\mozglue.dll

MD5 8f73c08a9660691143661bf7332c3c27
SHA1 37fa65dd737c50fda710fdbde89e51374d0c204a
SHA256 3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA512 0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

\ProgramData\msvcp140.dll

MD5 109f0f02fd37c84bfc7508d4227d7ed5
SHA1 ef7420141bb15ac334d3964082361a460bfdb975
SHA256 334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4
SHA512 46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

\ProgramData\vcruntime140.dll

MD5 7587bf9cb4147022cd5681b015183046
SHA1 f2106306a8f6f0da5afb7fc765cfa0757ad5a628
SHA256 c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d
SHA512 0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

memory/284-73-0x0000000000000000-mapping.dmp

memory/1068-74-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2021-08-03 22:30

Reported

2021-08-03 22:33

Platform

win10v20210408

Max time kernel

34s

Max time network

112s

Command Line

"C:\Users\Admin\AppData\Local\Temp\test (1).exe"

Signatures

Oski

infostealer oski

suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)

suricata

suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil

suricata

Downloads MZ/PE file

Uses the VBS compiler for execution

Accesses cryptocurrency files/wallets, possible credential harvesting

spyware

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 632 set thread context of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe N/A

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 632 wrote to memory of 2604 N/A C:\Users\Admin\AppData\Local\Temp\test (1).exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
PID 2604 wrote to memory of 4028 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 4028 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe C:\Windows\SysWOW64\cmd.exe
PID 2604 wrote to memory of 4028 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe C:\Windows\SysWOW64\cmd.exe
PID 4028 wrote to memory of 3880 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 4028 wrote to memory of 3880 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 4028 wrote to memory of 3880 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe

Processes

C:\Users\Admin\AppData\Local\Temp\test (1).exe

"C:\Users\Admin\AppData\Local\Temp\test (1).exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe

"\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c taskkill /pid 2604 & erase C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe & RD /S /Q C:\\ProgramData\\035833058780218\\* & exit

C:\Windows\SysWOW64\taskkill.exe

taskkill /pid 2604

Network

Country Destination Domain Proto
N/A 8.8.8.8:53 cdn.discordapp.com udp
N/A 162.159.130.233:443 cdn.discordapp.com tcp
N/A 8.8.8.8:53 notedemo.axfree.com udp
N/A 144.76.115.36:80 notedemo.axfree.com tcp
N/A 144.76.115.36:80 notedemo.axfree.com tcp

Files

memory/632-114-0x0000000000920000-0x0000000000921000-memory.dmp

memory/632-116-0x00000000054B0000-0x00000000054B1000-memory.dmp

memory/632-117-0x00000000052C0000-0x00000000052C5000-memory.dmp

memory/632-118-0x0000000005DA0000-0x0000000005DA1000-memory.dmp

memory/2604-119-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2604-120-0x000000000040717B-mapping.dmp

memory/2604-123-0x0000000000400000-0x0000000000438000-memory.dmp

\ProgramData\sqlite3.dll

MD5 e477a96c8f2b18d6b5c27bde49c990bf
SHA1 e980c9bf41330d1e5bd04556db4646a0210f7409
SHA256 16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512 335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

\ProgramData\nss3.dll

MD5 bfac4e3c5908856ba17d41edcd455a51
SHA1 8eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256 e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA512 2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

\ProgramData\mozglue.dll

MD5 8f73c08a9660691143661bf7332c3c27
SHA1 37fa65dd737c50fda710fdbde89e51374d0c204a
SHA256 3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA512 0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

memory/4028-127-0x0000000000000000-mapping.dmp

memory/3880-128-0x0000000000000000-mapping.dmp