oski | e6975dd38703f386f97f8875e92402b91b5e30aa526d1681f9b4541d776ae8da

Analysis

max time kernel
145s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
29-12-2023 19:32

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General

Target

PO# HM00050746 13461-001,xls.xll
Size

1.4MB
MD5

a719b4a9d08553ff7683ddcb7003d68b
SHA1

9039d4c0ed993549537bcf365fe35c553bd2ba50
SHA256

fd042d218a6adcb4d496f6d0e9f6fb3dfabdc24bc8bc86681480d76597ec258b
SHA512

74d52ac5dda28962ddceacc7df9da371f56401ef82fbcbc77fc900bb4608574e308eec97b654b1bd781b2ad588ac79daf0166fb10604e0305768aa069f5043c7
SSDEEP

24576:BzbGHAzHAjX1QcLg0jHe6GxAo594f7Byqx90KdI9K9nktTpcA+kukY:BziHICE0j+6GKoj49V989KVCiHlkY

Score

10^/10

oski infostealer spyware stealer

Malware Config

Extracted

Language

xlm4.0

Source

Extracted

Family

oski

himarkh.xyz

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
4876	service.exe
5104	service.exe

Loads dropped DLL 2 IoCs

pid	Process
3608	EXCEL.EXE
3608	EXCEL.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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4876 set thread context of 5104	4876	service.exe	106

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3616	5104	WerFault.exe	106

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
3608	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3608	EXCEL.EXE
3608	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE
3608	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3608 wrote to memory of 4876	3608	EXCEL.EXE	93
PID 3608 wrote to memory of 4876	3608	EXCEL.EXE	93
PID 3608 wrote to memory of 4876	3608	EXCEL.EXE	93
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106
PID 4876 wrote to memory of 5104	4876	service.exe	106

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\PO# HM00050746 13461-001,xls.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:3608
- C:\Users\Admin\AppData\Roaming\service.exe
  "C:\Users\Admin\AppData\Roaming\service.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:4876
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:5104
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5104 -s 1292
      4⤵
      Program crash
      PID:3616

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 5104 -ip 5104
1⤵
PID:844

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\service.exe

Filesize
996KB

MD5
fd488d558cce533dbdd6dd407ef1fd32

SHA1
bc57c81ad80d65fca56edde78cbf9db7ed53beb3

SHA256
2c37d0e68dc954c03b941ba7cd3188993bba2a5867093b8905c696f811e93914

SHA512
d14c80f803714ef9fb0b6e9169735ba30b6371e217d24bfdfc325c0058e5c470a82b652706f65ba733074fecc9471b35023fa7ad57e727b19554012da2c825f8

Download Submit
memory/3608-99-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-6-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-2-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-5-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-4-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-136-0x00007FFFB5130000-0x00007FFFB5BF1000-memory.dmp

Filesize
10.8MB

Download
memory/3608-7-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-11-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-15-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-135-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-20-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-19-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-23-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-22-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-21-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-17-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-16-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-14-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-13-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-25-0x000001E62FA20000-0x000001E62FB9C000-memory.dmp

Filesize
1.5MB

Download
memory/3608-28-0x000001E62FC00000-0x000001E62FC1C000-memory.dmp

Filesize
112KB

Download
memory/3608-29-0x000001E632950000-0x000001E63298C000-memory.dmp

Filesize
240KB

Download
memory/3608-30-0x00007FFFB5130000-0x00007FFFB5BF1000-memory.dmp

Filesize
10.8MB

Download
memory/3608-31-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-33-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-34-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-37-0x000001E62FD20000-0x000001E62FD30000-memory.dmp

Filesize
64KB

Download
memory/3608-36-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-35-0x000001E633F70000-0x000001E634074000-memory.dmp

Filesize
1.0MB

Download
memory/3608-32-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-12-0x00007FFF9ACB0000-0x00007FFF9ACC0000-memory.dmp

Filesize
64KB

Download
memory/3608-10-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-134-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-132-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-133-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-3-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-18-0x00007FFF9ACB0000-0x00007FFF9ACC0000-memory.dmp

Filesize
64KB

Download
memory/3608-9-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-8-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-131-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-1-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/3608-98-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-86-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-92-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-93-0x00007FFFDD350000-0x00007FFFDD545000-memory.dmp

Filesize
2.0MB

Download
memory/3608-94-0x00007FFFB5130000-0x00007FFFB5BF1000-memory.dmp

Filesize
10.8MB

Download
memory/3608-97-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-96-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-95-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-100-0x000001E64C3A0000-0x000001E64C3B0000-memory.dmp

Filesize
64KB

Download
memory/3608-0-0x00007FFF9D3D0000-0x00007FFF9D3E0000-memory.dmp

Filesize
64KB

Download
memory/4876-75-0x00000000059B0000-0x0000000005A4C000-memory.dmp

Filesize
624KB

Download
memory/4876-71-0x0000000000ED0000-0x0000000000FD0000-memory.dmp

Filesize
1024KB

Download
memory/4876-78-0x00000000070B0000-0x00000000070CA000-memory.dmp

Filesize
104KB

Download
memory/4876-74-0x0000000005900000-0x0000000005992000-memory.dmp

Filesize
584KB

Download
memory/4876-104-0x00000000099A0000-0x00000000099D8000-memory.dmp

Filesize
224KB

Download
memory/4876-72-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/4876-76-0x0000000005B70000-0x0000000005B80000-memory.dmp

Filesize
64KB

Download
memory/4876-101-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/4876-110-0x0000000074A80000-0x0000000075230000-memory.dmp

Filesize
7.7MB

Download
memory/4876-102-0x0000000005B70000-0x0000000005B80000-memory.dmp

Filesize
64KB

Download
memory/4876-103-0x0000000007350000-0x00000000073F0000-memory.dmp

Filesize
640KB

Download
memory/4876-73-0x0000000005F60000-0x0000000006504000-memory.dmp

Filesize
5.6MB

Download
memory/4876-77-0x0000000005880000-0x000000000588A000-memory.dmp

Filesize
40KB

Download
memory/5104-108-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5104-114-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5104-105-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5104-111-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5104-109-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads