oski | 49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47

General

Target

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe
Size

2.1MB
MD5

983654c42c7dbcfe606794d50dd06ace
SHA1

da0da07d82a7faee3d2d5b045b0eeb9b7d7aa855
SHA256

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47
SHA512

b397ba21a2bbb927aebcff171e8445a6a1002d401860d6817ea11bd6e4521742293607799ba6a7394d974542eeb43769e969fc64b1ec7b84600ac48d7e504e97

Score

10^/10

oski evasion infostealer spyware stealer themida trojan

Malware Config

Extracted

Family

oski

C2

sailent.xyz

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ 49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

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

Processes:

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.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

Themida packer 14 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/1704-55-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-56-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-57-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-58-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-59-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-60-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-62-0x0000000077650000-0x00000000777D0000-memory.dmp	themida
behavioral1/memory/1704-61-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-63-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-64-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-65-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-66-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-67-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida
behavioral1/memory/1704-68-0x0000000000A00000-0x0000000000F2D000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

pid process

1704 49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1248 1704 WerFault.exe 49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

pid	process
1704	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

pid	pid_target	process	target process
1248	1704	WerFault.exe	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe

description	pid	process	target process
PID 1704 wrote to memory of 1248	1704	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe	WerFault.exe
PID 1704 wrote to memory of 1248	1704	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe	WerFault.exe
PID 1704 wrote to memory of 1248	1704	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe	WerFault.exe
PID 1704 wrote to memory of 1248	1704	49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe
"C:\Users\Admin\AppData\Local\Temp\49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:1704

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1704 -s 820
2⤵
- Program crash
PID:1248

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

2

T1012

Virtualization/Sandbox Evasion

1

T1497

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/1248-70-0x0000000000000000-mapping.dmp

Download
memory/1704-61-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-62-0x0000000077650000-0x00000000777D0000-memory.dmp

Filesize
1.5MB

Download
memory/1704-57-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-58-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-63-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-60-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-56-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-54-0x0000000076241000-0x0000000076243000-memory.dmp

Filesize
8KB

Download
memory/1704-59-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-64-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-65-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-66-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-67-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-68-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download
memory/1704-69-0x0000000077650000-0x00000000777D0000-memory.dmp

Filesize
1.5MB

Download
memory/1704-55-0x0000000000A00000-0x0000000000F2D000-memory.dmp

Filesize
5.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads