oski | 338ffcde4891ef19f8b2974f2a9188e14a90f592322c8fb07acb662b57b35771

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
31-12-2023 01:46

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General

Target

2344d5013ae84f4d70bf359575fba402.xll
Size

879KB
MD5

2344d5013ae84f4d70bf359575fba402
SHA1

ed763a02ea15c388ec462cb9a4dfba22d0248631
SHA256

338ffcde4891ef19f8b2974f2a9188e14a90f592322c8fb07acb662b57b35771
SHA512

0d532edf4d2a6d2daab537dcb8e8e1b50cb0b27c3b0e4745b9748a06ecc287f025c77e1ee68172454b63a916e66bb611a930e2a0d22c1ff5922d2e98121e0a3d
SSDEEP

24576:pzbGHAzHAjX1lcLgUarYin3qy8sCwFCvlFC:pziHIvEzn3qy8QFW

Score

10^/10

oski infostealer

Malware Config

Extracted

Language

xlm4.0

Source

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski

Executes dropped EXE 2 IoCs

pid	Process
1452	service.exe
4812	service.exe

Loads dropped DLL 2 IoCs

pid	Process
3260	EXCEL.EXE
3260	EXCEL.EXE

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1452 set thread context of 4812	1452	service.exe	101

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4364	1452	WerFault.exe	94
1940	4812	WerFault.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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3260	EXCEL.EXE

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
1452	service.exe
1452	service.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3260	EXCEL.EXE
3260	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE
3260	EXCEL.EXE

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 3260 wrote to memory of 1452	3260	EXCEL.EXE	94
PID 3260 wrote to memory of 1452	3260	EXCEL.EXE	94
PID 3260 wrote to memory of 1452	3260	EXCEL.EXE	94
PID 1452 wrote to memory of 4812	1452	service.exe	101
PID 1452 wrote to memory of 4812	1452	service.exe	101
PID 1452 wrote to memory of 4812	1452	service.exe	101
PID 1452 wrote to memory of 4812	1452	service.exe	101

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\2344d5013ae84f4d70bf359575fba402.xll"
1⤵
- Loads dropped DLL
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3260
- C:\Users\Admin\AppData\Roaming\service.exe
  "C:\Users\Admin\AppData\Roaming\service.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:1452
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1452 -s 424
    3⤵
    - Program crash
    PID:4364
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:4812

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1452 -ip 1452
1⤵
PID:1404

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4812 -ip 4812
1⤵
PID:5112

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4812 -s 232
1⤵
- Program crash
PID:1940

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1452-78-0x0000000000CA0000-0x0000000000CA2000-memory.dmp

Filesize
8KB

Download
memory/1452-76-0x0000000000A00000-0x0000000000B00000-memory.dmp

Filesize
1024KB

Download
memory/3260-0-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-1-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-2-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-4-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-7-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-6-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-8-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-5-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-3-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-10-0x00007FF9354B0000-0x00007FF9354C0000-memory.dmp

Filesize
64KB

Download
memory/3260-9-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-11-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-12-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-15-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-16-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-18-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-20-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-21-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-22-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-19-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-17-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-24-0x000001A1F9A30000-0x000001A1F9B26000-memory.dmp

Filesize
984KB

Download
memory/3260-13-0x00007FF9354B0000-0x00007FF9354C0000-memory.dmp

Filesize
64KB

Download
memory/3260-14-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-27-0x000001A1F6BC0000-0x000001A1F6BDC000-memory.dmp

Filesize
112KB

Download
memory/3260-28-0x000001A1F6C30000-0x000001A1F6C6C000-memory.dmp

Filesize
240KB

Download
memory/3260-30-0x00007FF94E060000-0x00007FF94EB21000-memory.dmp

Filesize
10.8MB

Download
memory/3260-35-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-48-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-37-0x000001A1F6BE0000-0x000001A1F6BF0000-memory.dmp

Filesize
64KB

Download
memory/3260-36-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-34-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-33-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-32-0x000001A1FB200000-0x000001A1FB2B4000-memory.dmp

Filesize
720KB

Download
memory/3260-31-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-92-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-93-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-94-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-95-0x00007FF94E060000-0x00007FF94EB21000-memory.dmp

Filesize
10.8MB

Download
memory/3260-100-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-99-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-98-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-97-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-96-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-101-0x000001A1FB1F0000-0x000001A1FB200000-memory.dmp

Filesize
64KB

Download
memory/3260-118-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-121-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-120-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-119-0x00007FF937510000-0x00007FF937520000-memory.dmp

Filesize
64KB

Download
memory/3260-122-0x00007FF977490000-0x00007FF977685000-memory.dmp

Filesize
2.0MB

Download
memory/3260-123-0x00007FF94E060000-0x00007FF94EB21000-memory.dmp

Filesize
10.8MB

Download
memory/4812-77-0x0000000000390000-0x00000000003C8000-memory.dmp

Filesize
224KB

Download
memory/4812-86-0x0000000000390000-0x00000000003C8000-memory.dmp

Filesize
224KB

Download
memory/4812-83-0x0000000000390000-0x00000000003C8000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads