oski | c210434fcb39927f4a0d0a844a1a883f8274bc3b9e6d3e6e883f8072f316ca6a

General

Target

IMG052361778.exe
Size

691KB
MD5

74a962db45d6ab6c859ff627987bf1f6
SHA1

893b19a862fca02a5ec9ab0cd270a4970849ecb1
SHA256

c210434fcb39927f4a0d0a844a1a883f8274bc3b9e6d3e6e883f8072f316ca6a
SHA512

3a4e33f3f625e6c861eebb71a50bfbb693c102b896118d808317b546a7e6dbf28fe91b549b58d723dc27a207063a9822404ef8df3dd4a986e489b0851b1c999c

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

193.142.59.33

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Downloads MZ/PE file

Deletes itself 1 IoCs

pid	Process
1324	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1564	IMG052361778.exe
1564	IMG052361778.exe
1564	IMG052361778.exe
1564	IMG052361778.exe
1564	IMG052361778.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1684 set thread context of 1564	1684	IMG052361778.exe	30

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 1 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	IMG052361778.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1860	taskkill.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1684	IMG052361778.exe
1684	IMG052361778.exe
668	powershell.exe
668	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1684	IMG052361778.exe
Token: SeDebugPrivilege	668	powershell.exe
Token: SeDebugPrivilege	1860	taskkill.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1684 wrote to memory of 1512	1684	IMG052361778.exe	29
PID 1684 wrote to memory of 1512	1684	IMG052361778.exe	29
PID 1684 wrote to memory of 1512	1684	IMG052361778.exe	29
PID 1684 wrote to memory of 1512	1684	IMG052361778.exe	29
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1684 wrote to memory of 1564	1684	IMG052361778.exe	30
PID 1512 wrote to memory of 668	1512	WScript.exe	32
PID 1512 wrote to memory of 668	1512	WScript.exe	32
PID 1512 wrote to memory of 668	1512	WScript.exe	32
PID 1512 wrote to memory of 668	1512	WScript.exe	32
PID 1564 wrote to memory of 1324	1564	IMG052361778.exe	35
PID 1564 wrote to memory of 1324	1564	IMG052361778.exe	35
PID 1564 wrote to memory of 1324	1564	IMG052361778.exe	35
PID 1564 wrote to memory of 1324	1564	IMG052361778.exe	35
PID 1324 wrote to memory of 1860	1324	cmd.exe	37
PID 1324 wrote to memory of 1860	1324	cmd.exe	37
PID 1324 wrote to memory of 1860	1324	cmd.exe	37
PID 1324 wrote to memory of 1860	1324	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe
"C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1684
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\zIxmnitlaifc.vbs"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1512
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath C:\,'C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\notpad\notpad\notpad.exe'
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:668
- C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe
  C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1564
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1564 & erase C:\Users\Admin\AppData\Local\Temp\IMG052361778.exe & RD /S /Q C:\\ProgramData\\218003578373452\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1324
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1564
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1860

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/668-89-0x00000000056D0000-0x00000000056D1000-memory.dmp

Filesize
4KB

Download
memory/668-94-0x00000000057A0000-0x00000000057A1000-memory.dmp

Filesize
4KB

Download
memory/668-119-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download
memory/668-118-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download
memory/668-74-0x0000000000810000-0x0000000000811000-memory.dmp

Filesize
4KB

Download
memory/668-75-0x0000000004930000-0x0000000004931000-memory.dmp

Filesize
4KB

Download
memory/668-76-0x00000000048F0000-0x00000000048F1000-memory.dmp

Filesize
4KB

Download
memory/668-77-0x00000000048F2000-0x00000000048F3000-memory.dmp

Filesize
4KB

Download
memory/668-78-0x0000000002410000-0x0000000002411000-memory.dmp

Filesize
4KB

Download
memory/668-79-0x00000000026D0000-0x00000000026D1000-memory.dmp

Filesize
4KB

Download
memory/668-104-0x00000000055E0000-0x00000000055E1000-memory.dmp

Filesize
4KB

Download
memory/668-103-0x000000007EF30000-0x000000007EF31000-memory.dmp

Filesize
4KB

Download
memory/668-102-0x0000000006280000-0x0000000006281000-memory.dmp

Filesize
4KB

Download
memory/668-95-0x00000000061C0000-0x00000000061C1000-memory.dmp

Filesize
4KB

Download
memory/1512-67-0x0000000075B31000-0x0000000075B33000-memory.dmp

Filesize
8KB

Download
memory/1564-72-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1564-68-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1684-62-0x0000000004B10000-0x0000000004B11000-memory.dmp

Filesize
4KB

Download
memory/1684-60-0x0000000000FD0000-0x0000000000FD1000-memory.dmp

Filesize
4KB

Download
memory/1684-63-0x0000000000D10000-0x0000000000D88000-memory.dmp

Filesize
480KB

Download
memory/1684-64-0x00000000009E0000-0x00000000009FC000-memory.dmp

Filesize
112KB

Download

Analysis

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