Malware Analysis Report

2025-01-03 04:56

Sample ID 220404-d2wjdadehp
Target IMG_106_680_74_80.pdf
SHA256 9b26547086a1489e5534452021694af3a565fe76926e671112be4852947a5d27
Tags
oski infostealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

9b26547086a1489e5534452021694af3a565fe76926e671112be4852947a5d27

Threat Level: Known bad

The file IMG_106_680_74_80.pdf was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2022-04-04 03:30

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-04-04 03:30

Reported

2022-04-04 04:23

Platform

win7-20220331-en

Max time kernel

54s

Max time network

46s

Command Line

"C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1556 set thread context of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1556 wrote to memory of 1692 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe
PID 1692 wrote to memory of 968 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Windows\SysWOW64\WerFault.exe
PID 1692 wrote to memory of 968 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Windows\SysWOW64\WerFault.exe
PID 1692 wrote to memory of 968 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Windows\SysWOW64\WerFault.exe
PID 1692 wrote to memory of 968 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

"C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe"

C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1692 -s 112

Network

N/A

Files

memory/1556-54-0x0000000000DD0000-0x0000000000E32000-memory.dmp

memory/1556-55-0x0000000000380000-0x000000000038A000-memory.dmp

memory/1556-56-0x0000000000690000-0x00000000006B4000-memory.dmp

memory/1692-57-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1692-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1692-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1692-62-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1692-64-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1692-67-0x000000000040717B-mapping.dmp

memory/1692-66-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1692-69-0x0000000000400000-0x0000000000438000-memory.dmp

memory/968-70-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-04-04 03:30

Reported

2022-04-04 04:27

Platform

win10v2004-en-20220113

Max time kernel

134s

Max time network

146s

Command Line

"C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1676 set thread context of 2236 N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

"C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe"

C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

C:\Users\Admin\AppData\Local\Temp\IMG_106_680_74_80.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 200 -p 2236 -ip 2236

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2236 -s 236

Network

Country Destination Domain Proto
US 20.189.173.13:443 tcp

Files

memory/1676-130-0x0000000000570000-0x00000000005D2000-memory.dmp

memory/1676-131-0x0000000005060000-0x00000000050D6000-memory.dmp

memory/1676-132-0x0000000004F80000-0x0000000004F9E000-memory.dmp

memory/2236-133-0x0000000000000000-mapping.dmp

memory/2236-134-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2236-135-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2236-136-0x0000000000400000-0x0000000000438000-memory.dmp