oski | 80d5be2fd677e4bec23d07a9e56607c9f204731184163767951e585aab683dd7

Analysis

max time kernel
137s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
16-02-2024 05:27

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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

Processes:

service.exeservice.exe

pid	Process
3240	service.exe
4956	service.exe

Loads dropped DLL 2 IoCs

Processes:

EXCEL.EXE

pid	Process
1420	EXCEL.EXE
1420	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

Processes:

service.exe

description	pid	Process	procid_target
PID 3240 set thread context of 4956	3240	service.exe	96

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
3364	4956	WerFault.exe	96

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

Processes:

EXCEL.EXE

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

Processes:

EXCEL.EXE

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

Processes:

EXCEL.EXE

pid	Process
1420	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid	Process
1420	EXCEL.EXE
1420	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

Processes:

EXCEL.EXE

pid	Process
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE
1420	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

EXCEL.EXEservice.exe

description	pid	Process	procid_target
PID 1420 wrote to memory of 3240	1420	EXCEL.EXE	88
PID 1420 wrote to memory of 3240	1420	EXCEL.EXE	88
PID 1420 wrote to memory of 3240	1420	EXCEL.EXE	88
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96
PID 3240 wrote to memory of 4956	3240	service.exe	96

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:1420
- 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:3240
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:4956
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4956 -s 1228
      4⤵
      Program crash
      PID:3364

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4956 -ip 4956
1⤵
PID:4524

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\PO# HM00050746 13461-001,xls.xll

Filesize
1.4MB

MD5
a719b4a9d08553ff7683ddcb7003d68b

SHA1
9039d4c0ed993549537bcf365fe35c553bd2ba50

SHA256
fd042d218a6adcb4d496f6d0e9f6fb3dfabdc24bc8bc86681480d76597ec258b

SHA512
74d52ac5dda28962ddceacc7df9da371f56401ef82fbcbc77fc900bb4608574e308eec97b654b1bd781b2ad588ac79daf0166fb10604e0305768aa069f5043c7

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
64KB

MD5
adcffe8642dc00a4ffa3b3fc0f714913

SHA1
57c4609cb93fb3b39df0bc3849aa729c3436fd1a

SHA256
bc2419aba3272c09ddbf14fbb22a695929ff34314ff16b9684bb080a9de822d0

SHA512
2b548cc8511b56cb9f364ffbcd99cfd496d8ab0fe34d39a15a4a801f3e5c9bcaa388fd4d86ab52c190a3d6c08c2a54bdd013361189f315f623b49c872bb22d98

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

Filesize
964KB

MD5
26290bd5d8894f44aad3bf9acbfe7343

SHA1
e67e76e649e34602d3eedd5d9f500e5cff6ead14

SHA256
5cf015c5169ac573c0cdebc3822b1c33009e4c920eee4fc37ea6adbd0a60cd02

SHA512
2047754da0dfbe2ae375a3c54407470e45eabcc8dcc92025d2bbc0b556b2eab279363e1956d5e16eafa55eedbcc9c44dfd92e00795bbf2457811d6ba74e23816

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

Filesize
996KB

MD5
fd488d558cce533dbdd6dd407ef1fd32

SHA1
bc57c81ad80d65fca56edde78cbf9db7ed53beb3

SHA256
2c37d0e68dc954c03b941ba7cd3188993bba2a5867093b8905c696f811e93914

SHA512
d14c80f803714ef9fb0b6e9169735ba30b6371e217d24bfdfc325c0058e5c470a82b652706f65ba733074fecc9471b35023fa7ad57e727b19554012da2c825f8

Download Submit
memory/1420-81-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-15-0x00007FFC22430000-0x00007FFC22440000-memory.dmp

Filesize
64KB

Download
memory/1420-3-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-7-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-6-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-8-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-9-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-10-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-5-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-12-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-11-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-4-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-13-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-130-0x00007FFC3C9C0000-0x00007FFC3D481000-memory.dmp

Filesize
10.8MB

Download
memory/1420-16-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-14-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-17-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-19-0x00007FFC22430000-0x00007FFC22440000-memory.dmp

Filesize
64KB

Download
memory/1420-26-0x000001F187590000-0x000001F18770C000-memory.dmp

Filesize
1.5MB

Download
memory/1420-29-0x000001F188BF0000-0x000001F188C0C000-memory.dmp

Filesize
112KB

Download
memory/1420-30-0x00007FFC3C9C0000-0x00007FFC3D481000-memory.dmp

Filesize
10.8MB

Download
memory/1420-31-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-32-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-33-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-34-0x000001F188DB0000-0x000001F188DEC000-memory.dmp

Filesize
240KB

Download
memory/1420-35-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-36-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-37-0x000001F188E40000-0x000001F188F44000-memory.dmp

Filesize
1.0MB

Download
memory/1420-38-0x000001F188F40000-0x000001F188F50000-memory.dmp

Filesize
64KB

Download
memory/1420-2-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-129-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-128-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-1-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-125-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-126-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-127-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-0-0x00007FFC24D90000-0x00007FFC24DA0000-memory.dmp

Filesize
64KB

Download
memory/1420-94-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-85-0x00007FFC64D10000-0x00007FFC64F05000-memory.dmp

Filesize
2.0MB

Download
memory/1420-86-0x00007FFC3C9C0000-0x00007FFC3D481000-memory.dmp

Filesize
10.8MB

Download
memory/1420-89-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-90-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-91-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-92-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/1420-93-0x000001F188F80000-0x000001F188F90000-memory.dmp

Filesize
64KB

Download
memory/3240-78-0x0000000005330000-0x00000000058D4000-memory.dmp

Filesize
5.6MB

Download
memory/3240-96-0x0000000004FD0000-0x0000000004FE0000-memory.dmp

Filesize
64KB

Download
memory/3240-106-0x0000000074600000-0x0000000074DB0000-memory.dmp

Filesize
7.7MB

Download
memory/3240-84-0x0000000005B00000-0x0000000005B1A000-memory.dmp

Filesize
104KB

Download
memory/3240-98-0x00000000091A0000-0x00000000091D8000-memory.dmp

Filesize
224KB

Download
memory/3240-83-0x0000000004D30000-0x0000000004D3A000-memory.dmp

Filesize
40KB

Download
memory/3240-76-0x0000000074600000-0x0000000074DB0000-memory.dmp

Filesize
7.7MB

Download
memory/3240-95-0x0000000074600000-0x0000000074DB0000-memory.dmp

Filesize
7.7MB

Download
memory/3240-77-0x00000000001B0000-0x00000000002B0000-memory.dmp

Filesize
1024KB

Download
memory/3240-79-0x0000000004C80000-0x0000000004D12000-memory.dmp

Filesize
584KB

Download
memory/3240-97-0x0000000006B00000-0x0000000006BA0000-memory.dmp

Filesize
640KB

Download
memory/3240-80-0x0000000004E20000-0x0000000004EBC000-memory.dmp

Filesize
624KB

Download
memory/3240-82-0x0000000004FD0000-0x0000000004FE0000-memory.dmp

Filesize
64KB

Download
memory/4956-109-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4956-102-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4956-104-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4956-100-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4956-105-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download