oski | 59cdc5de14ab827ac9323c031a0726eee587d15f68488ba6046ab6752aa10214

Analysis

max time kernel
121s
max time network
169s
platform
windows7_x64
resource
win7v20210408
submitted
08/06/2021, 13:00

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General

Target
9-2.txt.exe
Size 210KB
Sample210608-kw9jca61ps
SHA256 59cdc5de14ab827ac9323c031a0726eee587d15f68488ba6046ab6752aa10214
MD5 cef4ce1d053dba2d344cbebbd478339b
SHA1 f411d2e96d6ab3cbb580d51dcaf5de20944d1218
SHA512 94386c3417c17c5791db97e28eeffaa5b53ecc97752fc7cc68108d3b152309cb86f3e7f2068c5b1bd012fde0eaaca7e6422fe2e47d4c944b385a4c0e2edf27ff
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

Deletes itself 1 IoCs

pid	Process
1464	cmd.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	9-2.txt.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1944	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1944	taskkill.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1092 wrote to memory of 1464	1092	9-2.txt.exe	31
PID 1092 wrote to memory of 1464	1092	9-2.txt.exe	31
PID 1092 wrote to memory of 1464	1092	9-2.txt.exe	31
PID 1092 wrote to memory of 1464	1092	9-2.txt.exe	31
PID 1464 wrote to memory of 1944	1464	cmd.exe	33
PID 1464 wrote to memory of 1944	1464	cmd.exe	33
PID 1464 wrote to memory of 1944	1464	cmd.exe	33
PID 1464 wrote to memory of 1944	1464	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\9-2.txt.exe
"C:\Users\Admin\AppData\Local\Temp\9-2.txt.exe"
1⤵
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1092
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c taskkill /pid 1092 & erase C:\Users\Admin\AppData\Local\Temp\9-2.txt.exe & RD /S /Q C:\\ProgramData\\698303035208545\\* & exit
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1464
- - C:\Windows\SysWOW64\taskkill.exe
    taskkill /pid 1092
    3⤵
    - Kills process with taskkill
    - Suspicious use of AdjustPrivilegeToken
    PID:1944

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

Replay Monitor

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Downloads

memory/1092-59-0x0000000075AA1000-0x0000000075AA3000-memory.dmp

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