Malware Analysis Report

2025-06-16 03:09

Sample ID 210803-b867h7edtn
Target da484abefb23789c13add9ecd7ea7eeb.exe
SHA256 223dfd54929007ac23d6a20dbcf81a519a14f1c4061d23afcb761b75796042d2
Tags
oski discovery infostealer spyware stealer 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

223dfd54929007ac23d6a20dbcf81a519a14f1c4061d23afcb761b75796042d2

Threat Level: Known bad

The file da484abefb23789c13add9ecd7ea7eeb.exe was found to be: Known bad.

Malicious Activity Summary

oski discovery infostealer spyware stealer suricata

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

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

Oski

Downloads MZ/PE file

Loads dropped DLL

Deletes itself

Reads user/profile data of web browsers

Accesses cryptocurrency files/wallets, possible credential harvesting

Checks installed software on the system

Suspicious use of SetThreadContext

Enumerates physical storage devices

Modifies Internet Explorer settings

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Checks processor information in registry

Kills process with taskkill

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2021-08-03 11:17

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2021-08-03 11:17

Reported

2021-08-03 11:20

Platform

win7v20210410

Max time kernel

15s

Max time network

39s

Command Line

"C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.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

Deletes itself

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

Reads user/profile data of web browsers

spyware stealer

Accesses cryptocurrency files/wallets, possible credential harvesting

spyware

Checks installed software on the system

discovery

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 916 set thread context of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe

Enumerates physical storage devices

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe N/A

Kills process with taskkill

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

Modifies Internet Explorer settings

adware spyware
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Main C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 916 wrote to memory of 756 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 756 wrote to memory of 1144 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Windows\SysWOW64\cmd.exe
PID 756 wrote to memory of 1144 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Windows\SysWOW64\cmd.exe
PID 756 wrote to memory of 1144 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Windows\SysWOW64\cmd.exe
PID 756 wrote to memory of 1144 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Windows\SysWOW64\cmd.exe
PID 1144 wrote to memory of 920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1144 wrote to memory of 920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1144 wrote to memory of 920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1144 wrote to memory of 920 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe

Processes

C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe

"C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe"

C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe

"C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c taskkill /pid 756 & erase C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe & RD /S /Q C:\\ProgramData\\420531560174735\\* & exit

C:\Windows\SysWOW64\taskkill.exe

taskkill /pid 756

Network

Country Destination Domain Proto
N/A 2.56.59.226:80 2.56.59.226 tcp

Files

memory/916-60-0x0000000000970000-0x0000000000971000-memory.dmp

memory/916-62-0x00000000043D0000-0x00000000043D1000-memory.dmp

memory/916-64-0x00000000043D2000-0x00000000043D3000-memory.dmp

memory/916-65-0x00000000043D7000-0x00000000043E8000-memory.dmp

memory/916-63-0x00000000043D1000-0x00000000043D2000-memory.dmp

memory/916-66-0x0000000008910000-0x000000000898E000-memory.dmp

memory/756-68-0x000000000040717B-mapping.dmp

memory/756-67-0x0000000000400000-0x000000000047F000-memory.dmp

memory/756-69-0x0000000075011000-0x0000000075013000-memory.dmp

memory/756-70-0x0000000000400000-0x000000000047F000-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/1144-76-0x0000000000000000-mapping.dmp

memory/920-77-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2021-08-03 11:17

Reported

2021-08-03 11:19

Platform

win10v20210408

Max time kernel

20s

Max time network

77s

Command Line

"C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.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

Reads user/profile data of web browsers

spyware stealer

Accesses cryptocurrency files/wallets, possible credential harvesting

spyware

Checks installed software on the system

discovery

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 808 set thread context of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe

Enumerates physical storage devices

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.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\da484abefb23789c13add9ecd7ea7eeb.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 808 wrote to memory of 200 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe
PID 200 wrote to memory of 1736 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Windows\SysWOW64\cmd.exe
PID 200 wrote to memory of 1736 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Windows\SysWOW64\cmd.exe
PID 200 wrote to memory of 1736 N/A C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe C:\Windows\SysWOW64\cmd.exe
PID 1736 wrote to memory of 2112 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1736 wrote to memory of 2112 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe
PID 1736 wrote to memory of 2112 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\taskkill.exe

Processes

C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe

"C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe"

C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe

"C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c taskkill /pid 200 & erase C:\Users\Admin\AppData\Local\Temp\da484abefb23789c13add9ecd7ea7eeb.exe & RD /S /Q C:\\ProgramData\\854858652776891\\* & exit

C:\Windows\SysWOW64\taskkill.exe

taskkill /pid 200

Network

Country Destination Domain Proto
N/A 2.56.59.226:80 2.56.59.226 tcp

Files

memory/808-114-0x00000000006E0000-0x00000000006E1000-memory.dmp

memory/808-116-0x00000000055A0000-0x00000000055A1000-memory.dmp

memory/808-117-0x0000000005140000-0x0000000005141000-memory.dmp

memory/808-118-0x00000000050A0000-0x000000000559E000-memory.dmp

memory/808-119-0x0000000005120000-0x0000000005121000-memory.dmp

memory/808-120-0x00000000050A0000-0x000000000559E000-memory.dmp

memory/808-121-0x00000000050A0000-0x000000000559E000-memory.dmp

memory/808-122-0x00000000050A0000-0x000000000559E000-memory.dmp

memory/808-123-0x0000000006B40000-0x0000000006B41000-memory.dmp

memory/808-124-0x0000000006BE0000-0x0000000006C5E000-memory.dmp

memory/200-125-0x0000000000400000-0x000000000047F000-memory.dmp

memory/200-126-0x000000000040717B-mapping.dmp

memory/200-127-0x0000000000400000-0x000000000047F000-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/1736-131-0x0000000000000000-mapping.dmp

memory/2112-132-0x0000000000000000-mapping.dmp