oski | 8ff42d08999e01de0a69872bc8b53e2b037f9d3ba7ddb8b210b3c04bfdcd2c71

General

Target
c59409eadfc776ab486cde93cdf70a93.exe
Size 388KB
Sample220313-w1fqmsbcek
SHA256 8ff42d08999e01de0a69872bc8b53e2b037f9d3ba7ddb8b210b3c04bfdcd2c71
MD5 c59409eadfc776ab486cde93cdf70a93
SHA1 70eb8d86ab3e128c452b5674ab0597b9183e5ad5
SHA512 7f009a280314591eb6ae44386da8d46cab5b54d2c3d78d7781437b18c6cfe243952ef07a2943a559af1619585db2f6978d92dae979b0f4ec59b025c7490f296b
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer suricata

Malware Config

Extracted

Family

oski

C2

http://basig5.xyz

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt) M2
suricata
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (passwords.txt) M2
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata
Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
4764	owhtw.exe
3024	owhtw.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2403053463-4052593947-3703345493-1000\Control Panel\International\Geo\Nation	owhtw.exe

Loads dropped DLL 3 IoCs

pid	Process
3024	owhtw.exe
3024	owhtw.exe
3024	owhtw.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
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	owhtw.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1984	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1984	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2824 wrote to memory of 4764	2824	c59409eadfc776ab486cde93cdf70a93.exe	82
PID 2824 wrote to memory of 4764	2824	c59409eadfc776ab486cde93cdf70a93.exe	82
PID 2824 wrote to memory of 4764	2824	c59409eadfc776ab486cde93cdf70a93.exe	82
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 4764 wrote to memory of 3024	4764	owhtw.exe	83
PID 3024 wrote to memory of 4332	3024	owhtw.exe	85
PID 3024 wrote to memory of 4332	3024	owhtw.exe	85
PID 3024 wrote to memory of 4332	3024	owhtw.exe	85
PID 4332 wrote to memory of 1984	4332	cmd.exe	87
PID 4332 wrote to memory of 1984	4332	cmd.exe	87
PID 4332 wrote to memory of 1984	4332	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\c59409eadfc776ab486cde93cdf70a93.exe
"C:\Users\Admin\AppData\Local\Temp\c59409eadfc776ab486cde93cdf70a93.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2824
- C:\Users\Admin\AppData\Local\Temp\owhtw.exe
  C:\Users\Admin\AppData\Local\Temp\owhtw.exe C:\Users\Admin\AppData\Local\Temp\llztvkfo
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:4764
- - C:\Users\Admin\AppData\Local\Temp\owhtw.exe
    C:\Users\Admin\AppData\Local\Temp\owhtw.exe C:\Users\Admin\AppData\Local\Temp\llztvkfo
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Loads dropped DLL
    - Checks processor information in registry
    - Suspicious use of WriteProcessMemory
    PID:3024
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /pid 3024 & erase C:\Users\Admin\AppData\Local\Temp\owhtw.exe & RD /S /Q C:\\ProgramData\\231423600815771\\* & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4332
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /pid 3024
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1984

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

2

T1081

Discovery

Query Registry

3

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/3024-139-0x0000000000C30000-0x0000000000C68000-memory.dmp

Download

memory/3024-142-0x0000000000C30000-0x0000000000C68000-memory.dmp

Download

memory/3024-145-0x0000000000C30000-0x0000000000C68000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads