oski | e1f7fb72586b1af9513a3d911465d3ed0a18e84f91a5264cfce5820eacc2ca44

Analysis

max time kernel
16s
max time network
119s
platform
windows10_x64
resource
win10v20210408
submitted
08/06/2021, 13:02

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
17-1.txt.exe
Size 242KB
Sample210608-1nk3d2ktse
SHA256 e1f7fb72586b1af9513a3d911465d3ed0a18e84f91a5264cfce5820eacc2ca44
MD5 dfbccb2f31e222557deb7df5b18c77f9
SHA1 ec7a99c20d6d00400a3ad587c7c7c017fcd14273
SHA512 8feea71ae1b1ec38173041c230d6d858b6f1b654a6df8834a467225b65621c065fab0f9a3927ed91123f0dfc0b74f651cba5b5aa17195af847d4dd60541dfcec
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
Downloads MZ/PE file

Loads dropped DLL 3 IoCs

pid	Process
4068	17-1.txt.exe
4068	17-1.txt.exe
4068	17-1.txt.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	17-1.txt.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1116	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1116	taskkill.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4068 wrote to memory of 212	4068	17-1.txt.exe	77
PID 4068 wrote to memory of 212	4068	17-1.txt.exe	77
PID 4068 wrote to memory of 212	4068	17-1.txt.exe	77
PID 212 wrote to memory of 1116	212	cmd.exe	79
PID 212 wrote to memory of 1116	212	cmd.exe	79
PID 212 wrote to memory of 1116	212	cmd.exe	79

C:\Users\Admin\AppData\Local\Temp\17-1.txt.exe
"C:\Users\Admin\AppData\Local\Temp\17-1.txt.exe"
1⤵
- Loads dropped DLL
- 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\17-1.txt.exe & RD /S /Q C:\\ProgramData\\657437163774565\\* & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:212
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 4068
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:1116

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

Replay Monitor

Loading Replay Monitor...

Downloads