oski | 4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1

General

Target

4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
Size

871KB
MD5

7380ccfe1c66527f163845b5532cf5db
SHA1

916cbf2b90d81317b4a8310a7b2ef0a8156faa7e
SHA256

4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1
SHA512

e9a94983c83cd419089caf87955f0767f97729c8ae713d98f4a343bb1caa6a963904753093da96b4574b96d706f8ec9c4f86ae4bd981135f34a9fa16a36f5eea

Score

10^/10

oski infostealer persistence spyware stealer vmprotect

Malware Config

Extracted

Family

oski

C2

www.emailonlinechase.com

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Suspicious use of NtCreateProcessExOtherParentProcess 1 IoCs

Processes:

WerFault.exe

description pid process target process

PID 1648 created 2516 1648 WerFault.exe 4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
Sets service image path in registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112

description	pid	process	target process
PID 1648 created 2516	1648	WerFault.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe

VMProtect packed file 1 IoCs

Detects executables packed with VMProtect commercial packer.

vmprotect

Processes:

resource	yara_rule
behavioral2/memory/2848-130-0x0000000000DE0000-0x0000000000EA8000-memory.dmp	vmprotect

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

Suspicious use of SetThreadContext 1 IoCs

Processes:

4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe

description	pid	process	target process
PID 2848 set thread context of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1928 2516 WerFault.exe 4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe

pid	pid_target	process	target process
1928	2516	WerFault.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe

Checks processor information in registry 2 TTPs 3 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

WerFault.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WerFault.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

WerFault.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WerFault.exe

Modifies data under HKEY_USERS 41 IoCs

Processes:

WaaSMedicAgent.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exeWerFault.exe

pid	process
2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
1928	WerFault.exe
1928	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exeWerFault.exe

description	pid	process
Token: SeDebugPrivilege	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
Token: SeRestorePrivilege	1928	WerFault.exe
Token: SeBackupPrivilege	1928	WerFault.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exeWerFault.exe

description	pid	process	target process
PID 2848 wrote to memory of 2244	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2244	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2244	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 2848 wrote to memory of 2516	2848	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 1648 wrote to memory of 2516	1648	WerFault.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
PID 1648 wrote to memory of 2516	1648	WerFault.exe	4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe

C:\Users\Admin\AppData\Local\Temp\4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
"C:\Users\Admin\AppData\Local\Temp\4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2848

C:\Users\Admin\AppData\Local\Temp\4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
"{path}"
2⤵
PID:2244

C:\Users\Admin\AppData\Local\Temp\4ae1f055edea4c9667047ce00c62924d58278e47ca8262725a89ae5c77354eb1.exe
"{path}"
2⤵
PID:2516

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2516 -s 1292
3⤵
- Program crash
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1928

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalServiceAndNoImpersonation -p
1⤵
PID:2504

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2516 -ip 2516
1⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Suspicious use of WriteProcessMemory
PID:1648

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe d2ca11ee1f5c9e216301f664cc4ce6a7 OCc6KrGzrkeGdk/2fP5osg.0.1.0.0.0
1⤵
- Modifies data under HKEY_USERS
PID:1696

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

memory/2516-136-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2516-137-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2848-130-0x0000000000DE0000-0x0000000000EA8000-memory.dmp

Filesize
800KB

Download
memory/2848-131-0x0000000005DF0000-0x0000000006394000-memory.dmp

Filesize
5.6MB

Download
memory/2848-132-0x00000000058E0000-0x0000000005972000-memory.dmp

Filesize
584KB

Download
memory/2848-133-0x00000000057F0000-0x0000000005821000-memory.dmp

Filesize
196KB

Download
memory/2848-134-0x0000000005890000-0x000000000589A000-memory.dmp

Filesize
40KB

Download
memory/2848-135-0x0000000007980000-0x0000000007A1C000-memory.dmp

Filesize
624KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads