oski | 28d5e4dcaadfbd31a3c06048031bf9070d8a6f81abeef808cdf4a6d5c19d783c

Analysis

max time kernel
40s
max time network
75s
platform
windows7_x64
resource
win7-20220414-en
resource tags

arch:x64arch:x86image:win7-20220414-enlocale:en-usos:windows7-x64system
submitted
18-07-2022 06:56

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General

Target

28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe
Size

322KB
MD5

f61ed5198e5dd131980bbd500c0aa319
SHA1

b777cb080166f9268067981e963455e084c5dfe2
SHA256

28d5e4dcaadfbd31a3c06048031bf9070d8a6f81abeef808cdf4a6d5c19d783c
SHA512

67ca7388607ffeaa980222f9cab550c2f8bd7c2099eeb41059ae1415dc3aa8e36c4feaf892e617819249bd34f9c3ede4eb554e9ae3bae83ea8ef67fe5fe31ae9

Score

10^/10

oski infostealer persistence spyware stealer suricata

Malware Config

Extracted

Family

oski

gemsbundle.com

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer HTTP POST Pattern
suricata
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
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\MbSAXaLzRE = "C:\\Users\\Admin\\AppData\\Roaming\\TpPsESMjAC\\YbZNCwDeSR.exe"	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 316 set thread context of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28

Program crash 1 IoCs

pid	pid_target	Process	procid_target
1548	1480	WerFault.exe	28

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 316 wrote to memory of 1480	316	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	28
PID 1480 wrote to memory of 1548	1480	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	31
PID 1480 wrote to memory of 1548	1480	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	31
PID 1480 wrote to memory of 1548	1480	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	31
PID 1480 wrote to memory of 1548	1480	28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe	31

C:\Users\Admin\AppData\Local\Temp\28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe
"C:\Users\Admin\AppData\Local\Temp\28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:316
- C:\Users\Admin\AppData\Local\Temp\28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe
  "C:\Users\Admin\AppData\Local\Temp\28D5E4DCAADFBD31A3C06048031BF9070D8A6F81ABEEF.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1480
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1480 -s 772
    3⤵
    - Program crash
    PID:1548

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/316-54-0x0000000000370000-0x00000000003C6000-memory.dmp

Filesize
344KB

Download
memory/316-55-0x0000000076431000-0x0000000076433000-memory.dmp

Filesize
8KB

Download
memory/316-56-0x0000000001DF0000-0x0000000001DFA000-memory.dmp

Filesize
40KB

Download
memory/1480-62-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-57-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-60-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-58-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-64-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-66-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-69-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-71-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1480-73-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download