oski | dce3cfe541188e0267da98342cecd47a6acdaec6827e6e7be35ffdc823c22a71

Analysis

max time kernel
120s
max time network
114s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
29-10-2024 22:14

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General

Target

sosi.exe
Size

200KB
MD5

46336799625b777d6ac52bff81d5604c
SHA1

0133461342d41df2e31f8a48c957c63c99793992
SHA256

dce3cfe541188e0267da98342cecd47a6acdaec6827e6e7be35ffdc823c22a71
SHA512

b8c04a060a7874000f6c4000079b50d14d28ca9286d1dde05997520509aa207e5c095ee1b15f3a782c19eab7f7aa054a69d0d974b2579cf199b0ef1e9cb1e480
SSDEEP

3072:WfUomEuYm98dlSq7gt5q7Dx+XgS6aCEwhOfUbCalNT2pbB3fIq1Xi6FLPo3c:WfUauY68uSWCx+XA7mg2pNn1Ljo3c

Score

10^/10

oski credential_access discovery infostealer spyware stealer

Malware Config

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Oski family
oski
Downloads MZ/PE file
Loads dropped DLL 1 IoCs

Processes:

sosi.exe

pid process

3756 sosi.exe
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
Unsecured Credentials: Credentials In Files 1 TTPs
Steal credentials from unsecured files.
credential_access stealer

Credentials In Files
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
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).

System Information Discovery
T1082

pid	process
3756	sosi.exe

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

sosi.execmd.exetaskkill.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sosi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	taskkill.exe

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

Processes:

sosi.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString sosi.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1324 taskkill.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

taskkill.exe

description pid process

Token: SeDebugPrivilege 1324 taskkill.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	sosi.exe

pid	process
1324	taskkill.exe

description	pid	process
Token: SeDebugPrivilege	1324	taskkill.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

sosi.execmd.exe

description	pid	process	target process
PID 3756 wrote to memory of 4368	3756	sosi.exe	cmd.exe
PID 3756 wrote to memory of 4368	3756	sosi.exe	cmd.exe
PID 3756 wrote to memory of 4368	3756	sosi.exe	cmd.exe
PID 4368 wrote to memory of 1324	4368	cmd.exe	taskkill.exe
PID 4368 wrote to memory of 1324	4368	cmd.exe	taskkill.exe
PID 4368 wrote to memory of 1324	4368	cmd.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\sosi.exe
"C:\Users\Admin\AppData\Local\Temp\sosi.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:3756

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 3756 & erase C:\Users\Admin\AppData\Local\Temp\sosi.exe & RD /S /Q C:\\ProgramData\\896449466092912\\* & exit
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4368

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 3756
3⤵
- System Location Discovery: System Language Discovery
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1324

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\sqlite3.dll

Filesize
630KB

MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

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