oski | 1f1e42adb9f46ac29b6ca7a75ec3ef3b111270bc978e6a17653b26f6fead7d2e

Analysis

max time kernel
101s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
29-01-2024 23:26

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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
5060	service.exe
4196	service.exe

Loads dropped DLL 2 IoCs

pid	Process
2136	EXCEL.EXE
2136	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 5060 set thread context of 4196	5060	service.exe	98

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4576	4196	WerFault.exe	98

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
2136	EXCEL.EXE

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
2136	EXCEL.EXE
2136	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE
2136	EXCEL.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2136 wrote to memory of 5060	2136	EXCEL.EXE	89
PID 2136 wrote to memory of 5060	2136	EXCEL.EXE	89
PID 2136 wrote to memory of 5060	2136	EXCEL.EXE	89
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98
PID 5060 wrote to memory of 4196	5060	service.exe	98

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:2136
- 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:5060
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:4196
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4196 -s 1316
      4⤵
      Program crash
      PID:4576

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 4196 -ip 4196
1⤵
PID:3444

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

Loading Replay Monitor...

Downloads

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

Filesize
336KB

MD5
244fd2c9b0b9362f88dbfd29e1cbd546

SHA1
21f4b88c0aa75773c0c64f0254cb5cf905b09226

SHA256
75a9c86c578546f16f15f16b66b1d83cf7cd6a8e3c412b7fe534d932734d1ef0

SHA512
9cc25fc29958b62478e133670de89838bde26125f688e16fe360bf177f00b3c0ac675c927311380f3d55990fb9064e00f06df8296dc30554568d35b657108ead

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

Filesize
374KB

MD5
d507e2a05934b837a53bc56c66ea9b88

SHA1
4883564b19d00903ac4b8784279335fc13f2b36e

SHA256
6fc1fc59e518c2fcba9f8ea56c69155116ffbcda9a7927eaec96be0d515d95ed

SHA512
46fa75809f414f7c9173e1503532af8b1916e45027f943a6b6907d4fc71d86310bacabb2e328bba51d9ad09b49fdc1ac08fcb3531b22d01bee4f3605fe0cd2ee

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
735KB

MD5
eae1a88868c72b18ea95a3a78debd7b6

SHA1
433be2335042c24c721be837bf653f900a4d732a

SHA256
180874c0bd8acc8d816f4fef6baf72baa56673ea924b3e73d5b590a8857c4bdf

SHA512
669309d82b5d8e6823b0d596907ceecb01a78ffad5c6ccdac0d8bd9f7f679b429ccbd08341ab1f40079e1c4887bcaeb7fc377c4709400257de31951ae7fa2bad

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

Filesize
241KB

MD5
499fc8aab8c0c41790580296eaade840

SHA1
84b270684d1cb5631786b01f9ba3b8a86ce8b396

SHA256
5578dee61f8a1b550a6c6a450e4d6acc522c33e8bed1b077c96389c608e7809f

SHA512
ee4319c610fa21a9ea67ee55a6957fb3ec89f3ee3364a4da96f95c14fcc153b730d4c5bac6837cef4ecfe56c7feed9cc71ce60c3b4f279ce0b736c41802f652d

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

Filesize
257KB

MD5
3cfe0f19db983f4e9f6c5413d35eda09

SHA1
059dea29ead2f3af034740520d6520f81f4d58c4

SHA256
4145ce5f063208ff7bc7518b75a79060dda3af0b3e71b06fc5a7b4b0dfc37e2f

SHA512
51592785b7f8bcf2d075a81cdab3240bc6b6ca80b001d08b77ed12837cb7d450515d8fbd36fdeb993fa142b2c8ff9b41deff1c31c706e4e5f355648c62154b7a

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

Filesize
319KB

MD5
d1de2bcfece34d4297f8ba32259e2b84

SHA1
cb5b8736bdf405b2ae6dc3a719b5b5264ef68340

SHA256
fff8856f94cdf92a4d3bee7defdb04be9e31340ddd6c2a6434005ffcfd899e72

SHA512
ece542a256b9ce3148bd45003c65952f772e6f631739b87c0ab9a64c30f30935dce42c6d9aa5e23e137e20a21f61615724eb81ca9ed5b51ce42914b5b4ec1ced

Download Submit
memory/2136-19-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-3-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-10-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-9-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-11-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-13-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-12-0x00007FF8A65C0000-0x00007FF8A65D0000-memory.dmp

Filesize
64KB

Download
memory/2136-14-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-15-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-16-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-17-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-1-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-20-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-133-0x00007FF8BFF90000-0x00007FF8C0A51000-memory.dmp

Filesize
10.8MB

Download
memory/2136-8-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-23-0x000001A51FCF0000-0x000001A51FE6C000-memory.dmp

Filesize
1.5MB

Download
memory/2136-6-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-26-0x000001A5215A0000-0x000001A5215BC000-memory.dmp

Filesize
112KB

Download
memory/2136-28-0x000001A5396E0000-0x000001A53971C000-memory.dmp

Filesize
240KB

Download
memory/2136-31-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-36-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-35-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-34-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-33-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-32-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-30-0x00007FF8BFF90000-0x00007FF8C0A51000-memory.dmp

Filesize
10.8MB

Download
memory/2136-40-0x000001A539760000-0x000001A539864000-memory.dmp

Filesize
1.0MB

Download
memory/2136-41-0x000001A5213E0000-0x000001A5213F0000-memory.dmp

Filesize
64KB

Download
memory/2136-7-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-4-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-132-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-2-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-131-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-18-0x00007FF8A65C0000-0x00007FF8A65D0000-memory.dmp

Filesize
64KB

Download
memory/2136-5-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-130-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-129-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-128-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-0-0x00007FF8A89B0000-0x00007FF8A89C0000-memory.dmp

Filesize
64KB

Download
memory/2136-97-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-86-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-87-0x00007FF8E8930000-0x00007FF8E8B25000-memory.dmp

Filesize
2.0MB

Download
memory/2136-88-0x00007FF8BFF90000-0x00007FF8C0A51000-memory.dmp

Filesize
10.8MB

Download
memory/2136-89-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-93-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-95-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-94-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/2136-96-0x000001A539860000-0x000001A539870000-memory.dmp

Filesize
64KB

Download
memory/4196-102-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4196-108-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4196-111-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4196-106-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/4196-105-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/5060-78-0x0000000005FE0000-0x0000000006584000-memory.dmp

Filesize
5.6MB

Download
memory/5060-82-0x0000000005A90000-0x0000000005A9A000-memory.dmp

Filesize
40KB

Download
memory/5060-98-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/5060-83-0x00000000072B0000-0x00000000072CA000-memory.dmp

Filesize
104KB

Download
memory/5060-101-0x0000000009C00000-0x0000000009C38000-memory.dmp

Filesize
224KB

Download
memory/5060-100-0x0000000007550000-0x00000000075F0000-memory.dmp

Filesize
640KB

Download
memory/5060-99-0x0000000005D90000-0x0000000005DA0000-memory.dmp

Filesize
64KB

Download
memory/5060-77-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/5060-80-0x0000000005B70000-0x0000000005C0C000-memory.dmp

Filesize
624KB

Download
memory/5060-76-0x0000000000FA0000-0x00000000010A0000-memory.dmp

Filesize
1024KB

Download
memory/5060-81-0x0000000005D90000-0x0000000005DA0000-memory.dmp

Filesize
64KB

Download
memory/5060-79-0x0000000005AD0000-0x0000000005B62000-memory.dmp

Filesize
584KB

Download
memory/5060-107-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads