oski | cc9b565ed7aaaefc71da6371a0352094df9efee30bd02a13f3cdcf649e6f4bbe

Analysis

max time kernel
13s
max time network
118s
platform
windows10_x64
resource
win10v20210410
submitted
08/06/2021, 13:02

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General

Target
17-3.txt.exe
Size 327KB
Sample210608-ts7f8jndxe
SHA256 cc9b565ed7aaaefc71da6371a0352094df9efee30bd02a13f3cdcf649e6f4bbe
MD5 787c9926d8de7be8656ab0f583eba27f
SHA1 5d3c2dbe5c4e47140d3f16db4ea769e7559b1515
SHA512 43f2f4e61e9a955576775c9ec682533f86921fd8660e5f21999f4450caa80d7dc6ac16040bbcfaa0e9420c83ab483b0744f10304fcbbb7ad2f4924fa80b6b032
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
3188	17-3.txt.exe
3188	17-3.txt.exe
3188	17-3.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	17-3.txt.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1320	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1320	taskkill.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3188 wrote to memory of 1560	3188	17-3.txt.exe	78
PID 3188 wrote to memory of 1560	3188	17-3.txt.exe	78
PID 3188 wrote to memory of 1560	3188	17-3.txt.exe	78
PID 1560 wrote to memory of 1320	1560	cmd.exe	80
PID 1560 wrote to memory of 1320	1560	cmd.exe	80
PID 1560 wrote to memory of 1320	1560	cmd.exe	80

C:\Users\Admin\AppData\Local\Temp\17-3.txt.exe
"C:\Users\Admin\AppData\Local\Temp\17-3.txt.exe"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:3188
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /pid 3188 & erase C:\Users\Admin\AppData\Local\Temp\17-3.txt.exe & RD /S /Q C:\\ProgramData\\028564682349868\\* & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1560
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 3188
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:1320

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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