oski | bef42b4bb33bf2edb112d4e084df6e7aaad37b429b00ac783b9fe14eb08ac3f6

General

Target

8325e7768964ebee192622a378e7f28f.exe
Size

747KB
MD5

8325e7768964ebee192622a378e7f28f
SHA1

47ad27a29e5d3c8449fe41287bc3957bb8c37aff
SHA256

bef42b4bb33bf2edb112d4e084df6e7aaad37b429b00ac783b9fe14eb08ac3f6
SHA512

ba2fd924cd43d9fd4dce8956e22dbe8e33c11fe35e8acf5262dd18e102a6dcf49e931dd532f96a759e87ebccc00d55255aac67c438fb689a2ea41f6cdcf0e465

Score

10^/10

oski discovery evasion infostealer spyware stealer

Malware Config

Extracted

Family

oski

C2

http://37.0.11.237/nn/

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	8325e7768964ebee192622a378e7f28f.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	8325e7768964ebee192622a378e7f28f.exe

Deletes itself 1 IoCs

pid	Process
896	cmd.exe

Loads dropped DLL 5 IoCs

pid	Process
1496	8325e7768964ebee192622a378e7f28f.exe
1496	8325e7768964ebee192622a378e7f28f.exe
1496	8325e7768964ebee192622a378e7f28f.exe
1496	8325e7768964ebee192622a378e7f28f.exe
1496	8325e7768964ebee192622a378e7f28f.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	8325e7768964ebee192622a378e7f28f.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	8325e7768964ebee192622a378e7f28f.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1212 set thread context of 1496	1212	8325e7768964ebee192622a378e7f28f.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	8325e7768964ebee192622a378e7f28f.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
300	taskkill.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	300	taskkill.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1212 wrote to memory of 1496	1212	8325e7768964ebee192622a378e7f28f.exe	30
PID 1496 wrote to memory of 896	1496	8325e7768964ebee192622a378e7f28f.exe	33
PID 1496 wrote to memory of 896	1496	8325e7768964ebee192622a378e7f28f.exe	33
PID 1496 wrote to memory of 896	1496	8325e7768964ebee192622a378e7f28f.exe	33
PID 1496 wrote to memory of 896	1496	8325e7768964ebee192622a378e7f28f.exe	33
PID 896 wrote to memory of 300	896	cmd.exe	35
PID 896 wrote to memory of 300	896	cmd.exe	35
PID 896 wrote to memory of 300	896	cmd.exe	35
PID 896 wrote to memory of 300	896	cmd.exe	35

C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe
"C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1212
- C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe
  "C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe"
  2⤵
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious use of WriteProcessMemory
  PID:1496
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /pid 1496 & erase C:\Users\Admin\AppData\Local\Temp\8325e7768964ebee192622a378e7f28f.exe & RD /S /Q C:\\ProgramData\\780397352818489\\* & exit
    3⤵
    - Deletes itself
    - Suspicious use of WriteProcessMemory
    PID:896
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /pid 1496
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:300

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/1212-64-0x0000000000A30000-0x0000000000A79000-memory.dmp

Filesize
292KB

Download
memory/1212-59-0x0000000000DD0000-0x0000000000DD1000-memory.dmp

Filesize
4KB

Download
memory/1212-63-0x0000000004E10000-0x0000000004E84000-memory.dmp

Filesize
464KB

Download
memory/1212-62-0x0000000000440000-0x000000000044F000-memory.dmp

Filesize
60KB

Download
memory/1212-61-0x0000000000630000-0x0000000000631000-memory.dmp

Filesize
4KB

Download
memory/1496-68-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1496-67-0x0000000076661000-0x0000000076663000-memory.dmp

Filesize
8KB

Download
memory/1496-65-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads