oski | 49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47

General

Target

983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe
Size

2.1MB
MD5

983654c42c7dbcfe606794d50dd06ace
SHA1

da0da07d82a7faee3d2d5b045b0eeb9b7d7aa855
SHA256

49255a7e201aebbd0dfd7e9384ada9d184f2fcdacbb054a897be53833b8a2f47
SHA512

b397ba21a2bbb927aebcff171e8445a6a1002d401860d6817ea11bd6e4521742293607799ba6a7394d974542eeb43769e969fc64b1ec7b84600ac48d7e504e97
SSDEEP

49152:TDqlM5ZAZMgcXJysAifSk+x9vIXgPFjMaZQILxNmD/bHjL5RSMkljS:TPgcZXqt7H6GaDvEjS

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:

983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.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:

983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.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
T1552.001

Themida packer 15 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/1744-0-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-2-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-4-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-3-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-6-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-5-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-8-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-12-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-7-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-11-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-10-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-9-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-13-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-14-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida
behavioral1/memory/1744-16-0x00000000013A0000-0x00000000018CD000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe

pid	Process
1744	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
2464	1744	WerFault.exe	27

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe

description	pid	Process	procid_target
PID 1744 wrote to memory of 2464	1744	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe	30
PID 1744 wrote to memory of 2464	1744	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe	30
PID 1744 wrote to memory of 2464	1744	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe	30
PID 1744 wrote to memory of 2464	1744	983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe	30

C:\Users\Admin\AppData\Local\Temp\983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\983654c42c7dbcfe606794d50dd06ace_JaffaCakes118.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:1744
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1744 -s 776
  2⤵
  - Program crash
  PID:2464

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Virtualization/Sandbox Evasion

1

T1497

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1744-0-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-1-0x0000000077640000-0x0000000077642000-memory.dmp

Filesize
8KB

Download
memory/1744-2-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-4-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-3-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-6-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-5-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-8-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-12-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-7-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-11-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-10-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-9-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-13-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-14-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download
memory/1744-16-0x00000000013A0000-0x00000000018CD000-memory.dmp

Filesize
5.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads