hxxps://www[.]upload[.]ee/files/14365900/Oski_Stealer[.]rar[.]html

General

Target

https://www.upload.ee/files/14365900/Oski_Stealer.rar.html

Score

1^/10

Malware Config

Signatures

Checks processor information in registry 2 TTPs 5 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

firefox.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Update Signature	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Update Revision	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~Mhz	firefox.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	firefox.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	firefox.exe

Modifies registry class 1 IoCs

Processes:

firefox.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings firefox.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings	firefox.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

Processes:

firefox.exe

description	pid	process
Token: SeDebugPrivilege	4848	firefox.exe
Token: SeDebugPrivilege	4848	firefox.exe
Token: SeDebugPrivilege	4848	firefox.exe
Token: SeDebugPrivilege	4848	firefox.exe
Token: SeDebugPrivilege	4848	firefox.exe
Token: SeDebugPrivilege	4848	firefox.exe
Token: SeDebugPrivilege	4848	firefox.exe

Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

firefox.exe

pid process

4848 firefox.exe
4848 firefox.exe
4848 firefox.exe
4848 firefox.exe
Suspicious use of SendNotifyMessage 3 IoCs

Processes:

firefox.exe

pid process

4848 firefox.exe
4848 firefox.exe
4848 firefox.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

firefox.exe

pid process

4848 firefox.exe

pid	process
4848	firefox.exe
4848	firefox.exe
4848	firefox.exe
4848	firefox.exe

pid	process
4848	firefox.exe
4848	firefox.exe
4848	firefox.exe

pid	process
4848	firefox.exe

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

firefox.exefirefox.exe

description	pid	process	target process
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 3812 wrote to memory of 4848	3812	firefox.exe	firefox.exe
PID 4848 wrote to memory of 4436	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 4436	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2320	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe
PID 4848 wrote to memory of 2128	4848	firefox.exe	firefox.exe

C:\Program Files\Mozilla Firefox\firefox.exe
"C:\Program Files\Mozilla Firefox\firefox.exe" https://www.upload.ee/files/14365900/Oski_Stealer.rar.html
1⤵
- Suspicious use of WriteProcessMemory
PID:3812

C:\Program Files\Mozilla Firefox\firefox.exe
"C:\Program Files\Mozilla Firefox\firefox.exe" https://www.upload.ee/files/14365900/Oski_Stealer.rar.html
2⤵
- Checks processor information in registry
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4848

C:\Program Files\Mozilla Firefox\firefox.exe
"C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4848.0.880004887\1665098134" -parentBuildID 20200403170909 -prefsHandle 1704 -prefMapHandle 1696 -prefsLen 1 -prefMapSize 220117 -appdir "C:\Program Files\Mozilla Firefox\browser" - 4848 "\\.\pipe\gecko-crash-server-pipe.4848" 1800 gpu
3⤵
PID:4436

C:\Program Files\Mozilla Firefox\firefox.exe
"C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4848.3.1491689669\391749259" -childID 1 -isForBrowser -prefsHandle 1556 -prefMapHandle 1552 -prefsLen 112 -prefMapSize 220117 -parentBuildID 20200403170909 -appdir "C:\Program Files\Mozilla Firefox\browser" - 4848 "\\.\pipe\gecko-crash-server-pipe.4848" 2460 tab
3⤵
PID:2320

C:\Program Files\Mozilla Firefox\firefox.exe
"C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc --channel="4848.13.589083859\354338099" -childID 2 -isForBrowser -prefsHandle 3628 -prefMapHandle 3624 -prefsLen 6894 -prefMapSize 220117 -parentBuildID 20200403170909 -appdir "C:\Program Files\Mozilla Firefox\browser" - 4848 "\\.\pipe\gecko-crash-server-pipe.4848" 3636 tab
3⤵
PID:2128

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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