oski | 096274fd9d732efd99db63e588c529184b5e7c27215eb09e6bab705ddfdc7d01

Analysis

max time kernel
112s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
19-12-2023 19:46

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General

Target

887e6a417f06bb6dc94f034935073101.exe
Size

440KB
MD5

887e6a417f06bb6dc94f034935073101
SHA1

832bd170fb82f13787f5cb0760da83510259c5ff
SHA256

096274fd9d732efd99db63e588c529184b5e7c27215eb09e6bab705ddfdc7d01
SHA512

e876077cbf778733817c82f5ce144cea000f5677827dad0c2509c35f5dd10cb082243e4f6c31c808a67b45e0d9acca322210935bc8b76b8b9da4e33adc45ca1a
SSDEEP

12288:K2sFVy12lhO0J7l94ZeybVMvaFp94AIACSI737:zsFMolOZleCD9BIAE37

Score

10^/10

oski infostealer spyware stealer upx

Malware Config

Extracted

Family

oski

agencybro.tech

Signatures

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

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\x.vbs	cmd.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

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3252-0-0x0000000000400000-0x000000000047D000-memory.dmp	upx
behavioral2/memory/3252-3-0x0000000000400000-0x000000000047D000-memory.dmp	upx

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3252 set thread context of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4692	4492	WerFault.exe	92

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3252	887e6a417f06bb6dc94f034935073101.exe
3252	887e6a417f06bb6dc94f034935073101.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3252	887e6a417f06bb6dc94f034935073101.exe
3252	887e6a417f06bb6dc94f034935073101.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3252 wrote to memory of 4168	3252	887e6a417f06bb6dc94f034935073101.exe	45
PID 3252 wrote to memory of 4168	3252	887e6a417f06bb6dc94f034935073101.exe	45
PID 3252 wrote to memory of 4168	3252	887e6a417f06bb6dc94f034935073101.exe	45
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92
PID 3252 wrote to memory of 4492	3252	887e6a417f06bb6dc94f034935073101.exe	92

C:\Users\Admin\AppData\Local\Temp\887e6a417f06bb6dc94f034935073101.exe
"C:\Users\Admin\AppData\Local\Temp\887e6a417f06bb6dc94f034935073101.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3252
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c echo on error resume next:CreateObject("WScript.Shell").Run "C:\Users\Admin\AppData\Local\Temp\887e6a417f06bb6dc94f034935073101.exe",1: >"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\x.vbs"
  2⤵
  - Drops startup file
  PID:4168
- C:\Users\Admin\AppData\Local\Temp\887e6a417f06bb6dc94f034935073101.exe
  C:\Users\Admin\AppData\Local\Temp\887e6a417f06bb6dc94f034935073101.exe
  2⤵
  PID:4492
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4492 -s 1308
    3⤵
    - Program crash
    PID:4692

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4492 -ip 4492
1⤵
PID:2748

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

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3252-0-0x0000000000400000-0x000000000047D000-memory.dmp

Filesize
500KB

Download
memory/3252-3-0x0000000000400000-0x000000000047D000-memory.dmp

Filesize
500KB

Download
memory/4492-2-0x0000000000400000-0x00000000019E0000-memory.dmp

Filesize
21.9MB

Download
memory/4492-4-0x0000000000400000-0x00000000019E0000-memory.dmp

Filesize
21.9MB

Download
memory/4492-5-0x0000000000400000-0x00000000019E0000-memory.dmp

Filesize
21.9MB

Download
memory/4492-6-0x0000000000400000-0x00000000019E0000-memory.dmp

Filesize
21.9MB

Download
memory/4492-10-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/4492-9-0x0000000000400000-0x00000000019E0000-memory.dmp

Filesize
21.9MB

Download