oski | b658ce4e95ffaa7288d69749ff05fa0073b68281bda83fbfb846ec77e9412ff1

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
15-01-2024 10:16

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General

Target

5cd29d239d3f04b7e1cb461fb2163a54.xll
Size

882KB
MD5

5cd29d239d3f04b7e1cb461fb2163a54
SHA1

19e0178a22a65e575ffa116b0bb4968159ace31f
SHA256

b658ce4e95ffaa7288d69749ff05fa0073b68281bda83fbfb846ec77e9412ff1
SHA512

761f33d326d1788f5fb148bff5ad3abafe2bccb308988fe3d617b34a0ac83127fa35c7591c7a11c109b95a9514253e84583a6075e0cc96455ff75ca2cbaaef6d
SSDEEP

12288:Pn/zDvGHAykHSzLW/4+8bzbBSreMddhgFK/UqWgaHv2prIsma4KAzya13Ui/vWng:3zbGHAzHAjX1QcLgaHv6bmaXkGi/vW

Score

10^/10

oski infostealer spyware stealer

Malware Config

Extracted

Language

xlm4.0

Source

Extracted

Family

oski

nedu1994.xyz

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
2928	service.exe
2520	service.exe

Loads dropped DLL 2 IoCs

pid	Process
1532	EXCEL.EXE
1532	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 2928 set thread context of 2520	2928	service.exe	58

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4000	2520	WerFault.exe	58

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 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
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	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
1532	EXCEL.EXE

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2928	service.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1532	EXCEL.EXE
1532	EXCEL.EXE

Suspicious use of SetWindowsHookEx 11 IoCs

pid	Process
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE
1532	EXCEL.EXE

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1532 wrote to memory of 2928	1532	EXCEL.EXE	56
PID 1532 wrote to memory of 2928	1532	EXCEL.EXE	56
PID 1532 wrote to memory of 2928	1532	EXCEL.EXE	56
PID 2928 wrote to memory of 2520	2928	service.exe	58
PID 2928 wrote to memory of 2520	2928	service.exe	58
PID 2928 wrote to memory of 2520	2928	service.exe	58
PID 2928 wrote to memory of 2520	2928	service.exe	58

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\5cd29d239d3f04b7e1cb461fb2163a54.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:1532
- C:\Users\Admin\AppData\Roaming\service.exe
  "C:\Users\Admin\AppData\Roaming\service.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:2928
- - C:\Users\Admin\AppData\Roaming\service.exe
    "C:\Users\Admin\AppData\Roaming\service.exe"
    3⤵
    - Executes dropped EXE
    PID:2520
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2520 -s 1312
      4⤵
      Program crash
      PID:4000

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2520 -ip 2520
1⤵
PID:2720

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\5cd29d239d3f04b7e1cb461fb2163a54.xll

Filesize
95KB

MD5
2cf5944fd026fffe7b8dc8047f8fa08b

SHA1
70423f5f1c32d489a774cdddaa57d6bda7490129

SHA256
b0a374b7583de2bab5bf96b77b9d625d6b9b8e9f59c4b9e371d22c2cbef920cf

SHA512
f5d6afd8f57cc2b8a97484dc6b347d6dbfc780905baaff40d0607a6f4e1976067912dce09dd4f252a299be3792d49b120f7f4807c67ddf843a07cbf9a53d4cec

Download Submit
C:\Users\Admin\AppData\Local\Temp\5cd29d239d3f04b7e1cb461fb2163a54.xll

Filesize
71KB

MD5
2fc92357a5f39fec032d3f9aa582f2cc

SHA1
6ae55f07f54fc4f9b0bd3a7e923d231dd13dcbfd

SHA256
685b8fc916fc01e5e473df6150589881f61b6b7d4f9b89e3255629b861a1ef01

SHA512
764ae803d53897380d1c55bdae9ab6f8677553580a8c9cf88c979daa24b20327cdc4f4cc0edf2a913f3617d7b4962334f16df5cb8aab9757a5ba0019ba3a1b34

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
37KB

MD5
bee3e66196b7e4e14e1235270b4f090a

SHA1
1a579744f37d6bd89db455141e67e54a1bb648b8

SHA256
f721b4d78c6f05346e9d48bc67f5e935cb6f24b8b7972995d558d1f8160c5fc9

SHA512
eb2b211a7e2f87910faec07bc8d404f9d350f922858d10b6f4eb6a5d235bd8933741871af8647135ab3ccf73b122ef29b791238274e2007ddf5af2669a315e5c

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

Filesize
33KB

MD5
91b8dcb2d7e12d9a1ee98f167c204273

SHA1
00f423e760620ed4a25b1edf861675cb995da699

SHA256
922d62dac8ae653d9b610fe7ceef0c2a63b0c124ae37257c19dbe307def85871

SHA512
bd9dd633e1dab1c2985156aa0d4734baa324fc36734e93850157d1674f47c15bd44ccfb3c11269b6629b2ad541c40aaacc7f7dc87d1b1e18cd814c5a3909e62e

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

Filesize
18KB

MD5
ca0427571c5fe7748857ae6c4a9568ac

SHA1
db284f5377bf294b5ffee22ef0eb98c691377982

SHA256
f570170f7f947ada8ca5311d8a178d2a374e725b65ea696d0c90bca3a9d8c341

SHA512
79648de1ad17af39ade8a5e93546c6d92c9c6e9bc3a6c34e1ac1186549f93e9b2af1e810ba6d6cfb09354417c8b3c0d7a85d063d7cf86bea98948c03965ebc18

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

Filesize
307KB

MD5
b77d6ad852a07967357551461fe4b162

SHA1
890f8e6640ff3c67e813c9a58d8cc16ccfa4288c

SHA256
80d15a0decd0f7c2731066f466aea3f76adc1de4efe03d6041e357f1f1248c9d

SHA512
8cb8de2e02c110e2d9d5d869d4aaa3e7a10ef34c0079c7971f3b520284063ea18aaba145e44c87d1dfcdaae279e6495abf2187208d6d0e5248ab384b5ab6329f

Download Submit
memory/1532-40-0x000001961E150000-0x000001961E160000-memory.dmp

Filesize
64KB

Download
memory/1532-14-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-32-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-13-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-31-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-16-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-17-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-19-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-20-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-22-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-21-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-18-0x00007FFB8E090000-0x00007FFB8E0A0000-memory.dmp

Filesize
64KB

Download
memory/1532-15-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-12-0x00007FFB8E090000-0x00007FFB8E0A0000-memory.dmp

Filesize
64KB

Download
memory/1532-8-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-6-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-25-0x000001961D510000-0x000001961D606000-memory.dmp

Filesize
984KB

Download
memory/1532-10-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-7-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-28-0x000001961F8E0000-0x000001961F8FC000-memory.dmp

Filesize
112KB

Download
memory/1532-29-0x000001961FA30000-0x000001961FA6C000-memory.dmp

Filesize
240KB

Download
memory/1532-36-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-35-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-34-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-30-0x00007FFBA7BE0000-0x00007FFBA86A1000-memory.dmp

Filesize
10.8MB

Download
memory/1532-0-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-39-0x000001961E0A0000-0x000001961E156000-memory.dmp

Filesize
728KB

Download
memory/1532-33-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-11-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-9-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-2-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-3-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-4-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-5-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-122-0x00007FFBA7BE0000-0x00007FFBA86A1000-memory.dmp

Filesize
10.8MB

Download
memory/1532-121-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-120-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-1-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-119-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-118-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-117-0x00007FFB900F0000-0x00007FFB90100000-memory.dmp

Filesize
64KB

Download
memory/1532-100-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-89-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-92-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-93-0x00007FFBD0070000-0x00007FFBD0265000-memory.dmp

Filesize
2.0MB

Download
memory/1532-94-0x00007FFBA7BE0000-0x00007FFBA86A1000-memory.dmp

Filesize
10.8MB

Download
memory/1532-96-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-95-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-99-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-98-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/1532-97-0x000001961F9E0000-0x000001961F9F0000-memory.dmp

Filesize
64KB

Download
memory/2520-85-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2520-78-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2520-81-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2520-82-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2520-80-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2928-76-0x0000000000A40000-0x0000000000B40000-memory.dmp

Filesize
1024KB

Download
memory/2928-77-0x00000000029C0000-0x00000000029C2000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads