oski | 6b95b02847bc1eae8b9b97da0cecb7f85f554314ecbea6affe44319ef1b5206b

General

Target

00001effb01cec7a867b5ccae0325fe1.exe
Size

841KB
MD5

00001effb01cec7a867b5ccae0325fe1
SHA1

b739d4641afc15cb9b63a39bdc9c3a9b9cd05f01
SHA256

6b95b02847bc1eae8b9b97da0cecb7f85f554314ecbea6affe44319ef1b5206b
SHA512

6eb45861358cfb3e94a220dc632f8d2f12d357a4134c99dbdb5265ae3a768f93396b3d9973a93aca04deb9129e73ce176fe94a1d6dfe7d30374bd2730e6b6a2e

Score

10^/10

oski discovery evasion infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

37.0.11.237/az/

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Downloads MZ/PE file
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS 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\SystemBiosVersion	00001effb01cec7a867b5ccae0325fe1.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	00001effb01cec7a867b5ccae0325fe1.exe

Deletes itself 1 IoCs

pid	Process
1132	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1872	00001effb01cec7a867b5ccae0325fe1.exe
1872	00001effb01cec7a867b5ccae0325fe1.exe
1872	00001effb01cec7a867b5ccae0325fe1.exe
1872	00001effb01cec7a867b5ccae0325fe1.exe
1872	00001effb01cec7a867b5ccae0325fe1.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

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	00001effb01cec7a867b5ccae0325fe1.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	00001effb01cec7a867b5ccae0325fe1.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1028 set thread context of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30

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	00001effb01cec7a867b5ccae0325fe1.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
1792	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1792	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1028 wrote to memory of 1872	1028	00001effb01cec7a867b5ccae0325fe1.exe	30
PID 1872 wrote to memory of 1132	1872	00001effb01cec7a867b5ccae0325fe1.exe	33
PID 1872 wrote to memory of 1132	1872	00001effb01cec7a867b5ccae0325fe1.exe	33
PID 1872 wrote to memory of 1132	1872	00001effb01cec7a867b5ccae0325fe1.exe	33
PID 1872 wrote to memory of 1132	1872	00001effb01cec7a867b5ccae0325fe1.exe	33
PID 1132 wrote to memory of 1792	1132	cmd.exe	35
PID 1132 wrote to memory of 1792	1132	cmd.exe	35
PID 1132 wrote to memory of 1792	1132	cmd.exe	35
PID 1132 wrote to memory of 1792	1132	cmd.exe	35

C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe
"C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1028
- C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe
  "C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1872
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1872 & erase C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe & RD /S /Q C:\\ProgramData\\691326412613181\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:1132
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1872
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1792

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Credentials in Files

2

T1081

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

4

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1028-65-0x0000000004E90000-0x0000000004ED9000-memory.dmp

Filesize
292KB

Download
memory/1028-0-0x00000000013D0000-0x00000000013D1000-memory.dmp

Filesize
4KB

Download
memory/1028-64-0x0000000005C80000-0x0000000005CFE000-memory.dmp

Filesize
504KB

Download
memory/1028-63-0x00000000003E0000-0x00000000003EF000-memory.dmp

Filesize
60KB

Download
memory/1028-2-0x0000000004950000-0x0000000004951000-memory.dmp

Filesize
4KB

Download
memory/1872-66-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1872-68-0x0000000075591000-0x0000000075593000-memory.dmp

Filesize
8KB

Download
memory/1872-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads