oski | e6975dd38703f386f97f8875e92402b91b5e30aa526d1681f9b4541d776ae8da

Analysis

max time kernel
145s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
30-12-2023 17:10

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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
4380	service.exe
2856	service.exe

Loads dropped DLL 2 IoCs

pid	Process
64	EXCEL.EXE
64	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 4380 set thread context of 2856	4380	service.exe	105

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1304	2856	WerFault.exe	105

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
64	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
64	EXCEL.EXE
64	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE
64	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 64 wrote to memory of 4380	64	EXCEL.EXE	92
PID 64 wrote to memory of 4380	64	EXCEL.EXE	92
PID 64 wrote to memory of 4380	64	EXCEL.EXE	92
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105
PID 4380 wrote to memory of 2856	4380	service.exe	105

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:64
- 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:4380
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:2856
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2856 -s 968
      4⤵
      Program crash
      PID:1304

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2856 -ip 2856
1⤵
PID:4676

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\PO# HM00050746 13461-001,xls.xll

Filesize
155KB

MD5
e23a4eb5fdf390353653850b4e270e5a

SHA1
2453b05e25a3eb267bfbd0917dd5309fc835d54b

SHA256
0d15aa6ee2ae617307020aade63ee48c220b5dc8c89a0adbf194e240c97f84cc

SHA512
fc327d68bba8e66c32f91560a53f8a872d034c20b47049972a1b4d194fe0d36df03f36bce05f5aa2b224cecbcb26b03ff22310fc64b4d84a640f4dd337dd1149

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

Filesize
102KB

MD5
fa5262b04c1f7d6b162605b727dde5f4

SHA1
702bf033dbc688c8469be11fdbd893c48b75f589

SHA256
06de435e4cc8f9875a5c60af9b7ce6fa91d9708de3f740b17cfde6545a350555

SHA512
d3a85d52800d1b864ad9173bc82c40608f8b97aa4f15142548587b3faf72f3610368ac42d1ecaa390efd81aa28f3f025a1cceffd852131d56dd724c0717486db

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
237KB

MD5
e20191de5bd14daec71b86a3b0dc0322

SHA1
8c02025c9d90ad4217de3881ad587f33edf616ac

SHA256
be0aec244b6456cae2f67f188100aea1f7225d95a933e4ef108874947ff1355a

SHA512
31751a98912d7bc46bb4c9ae87256c569f5aa5fffc79a4f829a835a8f1a0bf7fbca8db7e3cff34e5363b5bf770d69f6fcc018879dae9605faeb9597675359e67

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

Filesize
281KB

MD5
79a2a79f2dd953f68c462e964a27ab9a

SHA1
b0065abaef7509cbd37f1533175af81ef4dd7e23

SHA256
4e08613ceb59f9c9aa3fdb0e20e322074239c0174c553405990698104c4ed98b

SHA512
28fd9305d6ac9de44b6e55acb4b23a8a85ebeb3b922b1baea0b578c3abe545e29d0dc84b16787cc95629247649d785e7e4e20ab74e181b3ef0de03ebd376f886

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

Filesize
98KB

MD5
2c39cea4f78e199c7bd63ca4418b6c64

SHA1
d34f3734c6b38608ad15432e0bc6bb6b616cbf47

SHA256
9bbaecd11a9b35e9421f471f121a688d39404368e1922f9db9b2728ff37fad43

SHA512
455a89c6dc4f146f634b3ef94c9a94af894d723ee5ac154da18f7752378c6dab602b83849420098d52202d52ac3dd9c82451b594189c5dcf88a168a1334c5196

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

Filesize
996KB

MD5
fd488d558cce533dbdd6dd407ef1fd32

SHA1
bc57c81ad80d65fca56edde78cbf9db7ed53beb3

SHA256
2c37d0e68dc954c03b941ba7cd3188993bba2a5867093b8905c696f811e93914

SHA512
d14c80f803714ef9fb0b6e9169735ba30b6371e217d24bfdfc325c0058e5c470a82b652706f65ba733074fecc9471b35023fa7ad57e727b19554012da2c825f8

Download Submit
memory/64-25-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-30-0x0000022AC8950000-0x0000022AC8960000-memory.dmp

Filesize
64KB

Download
memory/64-9-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-10-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-12-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-11-0x00007FFEA9980000-0x00007FFEA9990000-memory.dmp

Filesize
64KB

Download
memory/64-13-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-14-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-15-0x00007FFEA9980000-0x00007FFEA9990000-memory.dmp

Filesize
64KB

Download
memory/64-17-0x0000022AC8780000-0x0000022AC88FC000-memory.dmp

Filesize
1.5MB

Download
memory/64-7-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-6-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-20-0x0000022AC8970000-0x0000022AC898C000-memory.dmp

Filesize
112KB

Download
memory/64-21-0x0000022AE4FB0000-0x0000022AE4FEC000-memory.dmp

Filesize
240KB

Download
memory/64-23-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-22-0x00007FFEC3870000-0x00007FFEC4331000-memory.dmp

Filesize
10.8MB

Download
memory/64-28-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-27-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-26-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-1-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-24-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-29-0x0000022AE5030000-0x0000022AE5134000-memory.dmp

Filesize
1.0MB

Download
memory/64-5-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-8-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-3-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-4-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-2-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-0-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-128-0x00007FFEC3870000-0x00007FFEC4331000-memory.dmp

Filesize
10.8MB

Download
memory/64-127-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-125-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-126-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-124-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-123-0x00007FFEABCD0000-0x00007FFEABCE0000-memory.dmp

Filesize
64KB

Download
memory/64-90-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-84-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-85-0x00007FFEEBC50000-0x00007FFEEBE45000-memory.dmp

Filesize
2.0MB

Download
memory/64-86-0x00007FFEC3870000-0x00007FFEC4331000-memory.dmp

Filesize
10.8MB

Download
memory/64-87-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-88-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-89-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-91-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/64-92-0x0000022AE4FA0000-0x0000022AE4FB0000-memory.dmp

Filesize
64KB

Download
memory/2856-107-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2856-103-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2856-101-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2856-99-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2856-97-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4380-71-0x0000000075020000-0x00000000757D0000-memory.dmp

Filesize
7.7MB

Download
memory/4380-96-0x00000000066B0000-0x00000000066E8000-memory.dmp

Filesize
224KB

Download
memory/4380-95-0x00000000065B0000-0x0000000006650000-memory.dmp

Filesize
640KB

Download
memory/4380-94-0x0000000004A00000-0x0000000004A10000-memory.dmp

Filesize
64KB

Download
memory/4380-102-0x0000000075020000-0x00000000757D0000-memory.dmp

Filesize
7.7MB

Download
memory/4380-93-0x0000000075020000-0x00000000757D0000-memory.dmp

Filesize
7.7MB

Download
memory/4380-78-0x0000000005A60000-0x0000000005A7A000-memory.dmp

Filesize
104KB

Download
memory/4380-77-0x0000000004A30000-0x0000000004A3A000-memory.dmp

Filesize
40KB

Download
memory/4380-76-0x0000000004A00000-0x0000000004A10000-memory.dmp

Filesize
64KB

Download
memory/4380-75-0x0000000004AF0000-0x0000000004B8C000-memory.dmp

Filesize
624KB

Download
memory/4380-74-0x0000000004A50000-0x0000000004AE2000-memory.dmp

Filesize
584KB

Download
memory/4380-73-0x0000000004F60000-0x0000000005504000-memory.dmp

Filesize
5.6MB

Download
memory/4380-72-0x0000000000030000-0x0000000000130000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads