oski | 930ad6fbbfbac743f4097748a7af399d3fbb61b1ba36bc6230803dcdfb357640

Analysis

max time kernel
128s
max time network
147s
platform
windows7_x64
resource
win7v20210408
submitted
17/09/2021, 09:36

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General

Target
16e153201be41825d56aaeac47183efd.exe
Size 812KB
Sample210917-lkz48saagl
SHA256 930ad6fbbfbac743f4097748a7af399d3fbb61b1ba36bc6230803dcdfb357640
MD5 16e153201be41825d56aaeac47183efd
SHA1 980367f1702c355961144c8f5cd6444c1f58baa8
SHA512 c0c75f37cc18074a29ddb9013692fe903e9d6e6af87210093137352ef5f6f653a4a14adf3799e585117e22b9707a2f9eaf5030e1aa703edbae1c3c641f55616a
MD5 SHA1 SHA512

Score

10^/10

oski discovery infostealer persistence spyware stealer suricata

Malware Config

Extracted

Family

oski

103.141.138.110/p2/

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 Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata
Downloads MZ/PE file

Deletes itself 1 IoCs

pid	Process
1600	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1608	16e153201be41825d56aaeac47183efd.exe
1608	16e153201be41825d56aaeac47183efd.exe
1608	16e153201be41825d56aaeac47183efd.exe
1608	16e153201be41825d56aaeac47183efd.exe
1608	16e153201be41825d56aaeac47183efd.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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Windows\CurrentVersion\Run\Ymwqrsx = "C:\\Users\\Public\\Libraries\\xsrqwmY.url"	16e153201be41825d56aaeac47183efd.exe

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1960 set thread context of 1608	1960	16e153201be41825d56aaeac47183efd.exe	29

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	16e153201be41825d56aaeac47183efd.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
272	taskkill.exe

Modifies registry key 1 TTPs 3 IoCs

Modify Registry

T1112

pid	Process
704	reg.exe
1120	reg.exe
1096	reg.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	272	taskkill.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1960 wrote to memory of 1608	1960	16e153201be41825d56aaeac47183efd.exe	29
PID 1960 wrote to memory of 1608	1960	16e153201be41825d56aaeac47183efd.exe	29
PID 1960 wrote to memory of 1608	1960	16e153201be41825d56aaeac47183efd.exe	29
PID 1960 wrote to memory of 1608	1960	16e153201be41825d56aaeac47183efd.exe	29
PID 1960 wrote to memory of 1608	1960	16e153201be41825d56aaeac47183efd.exe	29
PID 1960 wrote to memory of 1608	1960	16e153201be41825d56aaeac47183efd.exe	29
PID 1960 wrote to memory of 1568	1960	16e153201be41825d56aaeac47183efd.exe	30
PID 1960 wrote to memory of 1568	1960	16e153201be41825d56aaeac47183efd.exe	30
PID 1960 wrote to memory of 1568	1960	16e153201be41825d56aaeac47183efd.exe	30
PID 1960 wrote to memory of 1568	1960	16e153201be41825d56aaeac47183efd.exe	30
PID 1568 wrote to memory of 764	1568	cmd.exe	32
PID 1568 wrote to memory of 764	1568	cmd.exe	32
PID 1568 wrote to memory of 764	1568	cmd.exe	32
PID 1568 wrote to memory of 764	1568	cmd.exe	32
PID 764 wrote to memory of 704	764	cmd.exe	34
PID 764 wrote to memory of 704	764	cmd.exe	34
PID 764 wrote to memory of 704	764	cmd.exe	34
PID 764 wrote to memory of 704	764	cmd.exe	34
PID 764 wrote to memory of 1120	764	cmd.exe	35
PID 764 wrote to memory of 1120	764	cmd.exe	35
PID 764 wrote to memory of 1120	764	cmd.exe	35
PID 764 wrote to memory of 1120	764	cmd.exe	35
PID 764 wrote to memory of 1680	764	cmd.exe	36
PID 764 wrote to memory of 1680	764	cmd.exe	36
PID 764 wrote to memory of 1680	764	cmd.exe	36
PID 764 wrote to memory of 1680	764	cmd.exe	36
PID 1960 wrote to memory of 1648	1960	16e153201be41825d56aaeac47183efd.exe	37
PID 1960 wrote to memory of 1648	1960	16e153201be41825d56aaeac47183efd.exe	37
PID 1960 wrote to memory of 1648	1960	16e153201be41825d56aaeac47183efd.exe	37
PID 1960 wrote to memory of 1648	1960	16e153201be41825d56aaeac47183efd.exe	37
PID 1648 wrote to memory of 1096	1648	cmd.exe	39
PID 1648 wrote to memory of 1096	1648	cmd.exe	39
PID 1648 wrote to memory of 1096	1648	cmd.exe	39
PID 1648 wrote to memory of 1096	1648	cmd.exe	39
PID 1608 wrote to memory of 1600	1608	16e153201be41825d56aaeac47183efd.exe	41
PID 1608 wrote to memory of 1600	1608	16e153201be41825d56aaeac47183efd.exe	41
PID 1608 wrote to memory of 1600	1608	16e153201be41825d56aaeac47183efd.exe	41
PID 1608 wrote to memory of 1600	1608	16e153201be41825d56aaeac47183efd.exe	41
PID 1600 wrote to memory of 272	1600	cmd.exe	43
PID 1600 wrote to memory of 272	1600	cmd.exe	43
PID 1600 wrote to memory of 272	1600	cmd.exe	43
PID 1600 wrote to memory of 272	1600	cmd.exe	43

C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe
"C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1960
- C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe
  C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1608
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1608 & erase C:\Users\Admin\AppData\Local\Temp\16e153201be41825d56aaeac47183efd.exe & RD /S /Q C:\\ProgramData\\184711566378672\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1600
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1608
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:272
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Public\Trast.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1568
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K C:\Users\Public\UKO.bat
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:764
  - - C:\Windows\SysWOW64\reg.exe
      reg delete hkcu\Environment /v windir /f
      4⤵
      Modifies registry key
      PID:704
  - - C:\Windows\SysWOW64\reg.exe
      reg add hkcu\Environment /v windir /d "cmd /c start /min C:\Users\Public\KDECO.bat reg delete hkcu\Environment /v windir /f && REM "
      4⤵
      Modifies registry key
      PID:1120
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /Run /TN \Microsoft\Windows\DiskCleanup\SilentCleanup /I
      4⤵
      PID:1680
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Public\nest.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1648
- - C:\Windows\SysWOW64\reg.exe
    reg delete hkcu\Environment /v windir /f
    3⤵
    - Modifies registry key
    PID:1096

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

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

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Downloads

memory/1608-65-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1608-70-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/1960-63-0x0000000000220000-0x0000000000221000-memory.dmp

Download

memory/1960-64-0x0000000075201000-0x0000000075203000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads