oski | 73b6c357dc80c90d0272f0e88849bcb43b37240a956e48826ac879cae5d5bd4c

Analysis

max time kernel
12s
max time network
135s
platform
windows10_x64
resource
win10v20210410
submitted
08/06/2021, 13:05

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General

Target
24-1.txt.exe
Size 242KB
Sample210608-vajdksbc3n
SHA256 73b6c357dc80c90d0272f0e88849bcb43b37240a956e48826ac879cae5d5bd4c
MD5 d0c287a62387c7dc0d5a8063fab75303
SHA1 5d69dda2577f44aa9661d4e1c590119717f1ade1
SHA512 b196c8fc75dabe7b3e8eee121932962ddf7079ea96a8591a792c5d59e4266842967630f72f920f9651c7568996151fb1bcd01ac7ad6cfe0852d2834f6c6c019e
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer spyware stealer

Malware Config

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
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	24-1.txt.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
2984	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2984	taskkill.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4068 wrote to memory of 2388	4068	24-1.txt.exe	74
PID 4068 wrote to memory of 2388	4068	24-1.txt.exe	74
PID 4068 wrote to memory of 2388	4068	24-1.txt.exe	74
PID 2388 wrote to memory of 2984	2388	cmd.exe	76
PID 2388 wrote to memory of 2984	2388	cmd.exe	76
PID 2388 wrote to memory of 2984	2388	cmd.exe	76

C:\Users\Admin\AppData\Local\Temp\24-1.txt.exe
"C:\Users\Admin\AppData\Local\Temp\24-1.txt.exe"
1⤵
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:4068
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /pid 4068 & erase C:\Users\Admin\AppData\Local\Temp\24-1.txt.exe & RD /S /Q C:\\ProgramData\\781924734501787\\* & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2388
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 4068
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:2984

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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