oski | fd042d218a6adcb4d496f6d0e9f6fb3dfabdc24bc8bc86681480d76597ec258b

Analysis

max time kernel
141s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
26-02-2024 18:58

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General

Target

a719b4a9d08553ff7683ddcb7003d68b.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
4320	service.exe
860	service.exe

Loads dropped DLL 2 IoCs

pid	Process
884	EXCEL.EXE
884	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 4320 set thread context of 860	4320	service.exe	103

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2668	860	WerFault.exe	103

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

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
884	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
884	EXCEL.EXE
884	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE
884	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 884 wrote to memory of 4320	884	EXCEL.EXE	100
PID 884 wrote to memory of 4320	884	EXCEL.EXE	100
PID 884 wrote to memory of 4320	884	EXCEL.EXE	100
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103
PID 4320 wrote to memory of 860	4320	service.exe	103

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\a719b4a9d08553ff7683ddcb7003d68b.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:884
- 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:4320
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:860
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 860 -s 1344
      4⤵
      Program crash
      PID:2668

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3696 --field-trial-handle=3192,i,2785050981002401924,4037047756083432660,262144 --variations-seed-version /prefetch:8
1⤵
PID:3084

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 860 -ip 860
1⤵
PID:2664

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\Local\Temp\a719b4a9d08553ff7683ddcb7003d68b.xll

Filesize
303KB

MD5
3e5e38ad345730163190497c76096f7c

SHA1
a29f4fcc998605f8a41303a5653dc6396226e715

SHA256
654a3a8c6280f46d639236c6577b264745431ee56a3268ac1b20101873b2cb64

SHA512
fa7a252c186185016ffd23911ddb6d300fc371a6c755fc119ce6e8002673af2fd69398f382e983a06592536bbfaacc5fbb2fba334b6611ee3a6b01dd50f85a43

Download Submit
C:\Users\Admin\AppData\Local\Temp\a719b4a9d08553ff7683ddcb7003d68b.xll

Filesize
322KB

MD5
a1f3f8661a0f0f130bd6d94efd577cbe

SHA1
700f60669b44659da9d043c69c70a10085cc9e1b

SHA256
02b0a688a7b81b9f113a7190ba0396d0e69abe01fa8bd89637b16873210b6b77

SHA512
318ae73121997dfc5b9d8ec1ebd64c2d8140543a867552a81a007e051ffda0acae2f6e71c3b4c41def102966468b241682dc5478ee8ba812d8a786c5dbd0b9f7

Download Submit
C:\Users\Admin\AppData\Local\Temp\sample.xlsx

Filesize
12KB

MD5
36cadc2fa9f7938f74061fda9b126a9f

SHA1
5252934ac46fb3bc8fdb361880ade043070501bd

SHA256
afc8ea53b3eeb62a44ce6d2b4593931d009ec00769410e76478cc88eab59d1f4

SHA512
b7668575cea53280a3d553b18e1ac7670eeafab9f2d48db5d86496722e2b1d5d48a3ac3b1e56a8d7198abd771f2d95fef4449792c214dffc2097e62273e7db1f

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

Filesize
996KB

MD5
fd488d558cce533dbdd6dd407ef1fd32

SHA1
bc57c81ad80d65fca56edde78cbf9db7ed53beb3

SHA256
2c37d0e68dc954c03b941ba7cd3188993bba2a5867093b8905c696f811e93914

SHA512
d14c80f803714ef9fb0b6e9169735ba30b6371e217d24bfdfc325c0058e5c470a82b652706f65ba733074fecc9471b35023fa7ad57e727b19554012da2c825f8

Download Submit
memory/860-116-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/860-112-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/860-111-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/860-110-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/860-107-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/884-40-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-63-0x0000017C25C90000-0x0000017C26751000-memory.dmp

Filesize
10.8MB

Download
memory/884-7-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-8-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-9-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-10-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-11-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-12-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-13-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-15-0x00007FFEB3C20000-0x00007FFEB3C30000-memory.dmp

Filesize
64KB

Download
memory/884-14-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-16-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-17-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-18-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-19-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-20-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-21-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-22-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-23-0x00007FFEB3C20000-0x00007FFEB3C30000-memory.dmp

Filesize
64KB

Download
memory/884-30-0x0000017C24610000-0x0000017C2478C000-memory.dmp

Filesize
1.5MB

Download
memory/884-33-0x0000017C26870000-0x0000017C2688C000-memory.dmp

Filesize
112KB

Download
memory/884-34-0x0000017C25C90000-0x0000017C26751000-memory.dmp

Filesize
10.8MB

Download
memory/884-35-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-37-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-39-0x0000017C3E930000-0x0000017C3E96C000-memory.dmp

Filesize
240KB

Download
memory/884-38-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-36-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-5-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-41-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-42-0x0000017C1F3B0000-0x0000017C1F4B4000-memory.dmp

Filesize
1.0MB

Download
memory/884-43-0x0000017C1F2D0000-0x0000017C1F2E0000-memory.dmp

Filesize
64KB

Download
memory/884-6-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-84-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-138-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-137-0x0000017C25C90000-0x0000017C26751000-memory.dmp

Filesize
10.8MB

Download
memory/884-136-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-135-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-85-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-134-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-133-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-0-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-2-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-89-0x0000017C25C90000-0x0000017C26751000-memory.dmp

Filesize
10.8MB

Download
memory/884-91-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-92-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-93-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-96-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-97-0x0000017C3E9C0000-0x0000017C3E9D0000-memory.dmp

Filesize
64KB

Download
memory/884-1-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/884-4-0x00007FFEF6070000-0x00007FFEF6265000-memory.dmp

Filesize
2.0MB

Download
memory/884-3-0x00007FFEB60F0000-0x00007FFEB6100000-memory.dmp

Filesize
64KB

Download
memory/4320-87-0x0000000004F50000-0x0000000004F5A000-memory.dmp

Filesize
40KB

Download
memory/4320-105-0x0000000006A00000-0x0000000006AA0000-memory.dmp

Filesize
640KB

Download
memory/4320-101-0x0000000005330000-0x0000000005340000-memory.dmp

Filesize
64KB

Download
memory/4320-99-0x0000000074520000-0x0000000074CD0000-memory.dmp

Filesize
7.7MB

Download
memory/4320-88-0x00000000054F0000-0x000000000550A000-memory.dmp

Filesize
104KB

Download
memory/4320-113-0x0000000074520000-0x0000000074CD0000-memory.dmp

Filesize
7.7MB

Download
memory/4320-106-0x0000000006B00000-0x0000000006B38000-memory.dmp

Filesize
224KB

Download
memory/4320-86-0x0000000005330000-0x0000000005340000-memory.dmp

Filesize
64KB

Download
memory/4320-83-0x00000000050B0000-0x000000000514C000-memory.dmp

Filesize
624KB

Download
memory/4320-82-0x0000000004F70000-0x0000000005002000-memory.dmp

Filesize
584KB

Download
memory/4320-81-0x0000000005520000-0x0000000005AC4000-memory.dmp

Filesize
5.6MB

Download
memory/4320-80-0x0000000000470000-0x0000000000570000-memory.dmp

Filesize
1024KB

Download
memory/4320-79-0x0000000074520000-0x0000000074CD0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads