Malware Analysis Report

2025-01-03 04:56

Sample ID 220404-dwn74sdbhq
Target DFI_0451_587_032.pdf
SHA256 bbd4dd21dde67a96ac02aa9795ce662fa36d4edb90d13f2ffbdeee0d4aea5050
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

bbd4dd21dde67a96ac02aa9795ce662fa36d4edb90d13f2ffbdeee0d4aea5050

Threat Level: Known bad

The file DFI_0451_587_032.pdf was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2022-04-04 03:21

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-04-04 03:21

Reported

2022-04-04 03:47

Platform

win7-20220331-en

Max time kernel

54s

Max time network

45s

Command Line

"C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1224 set thread context of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1224 wrote to memory of 1340 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe
PID 1340 wrote to memory of 2036 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Windows\SysWOW64\WerFault.exe
PID 1340 wrote to memory of 2036 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Windows\SysWOW64\WerFault.exe
PID 1340 wrote to memory of 2036 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Windows\SysWOW64\WerFault.exe
PID 1340 wrote to memory of 2036 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

"C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe"

C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1340 -s 112

Network

N/A

Files

memory/1224-54-0x0000000000E80000-0x0000000000EE0000-memory.dmp

memory/1224-55-0x00000000002F0000-0x00000000002FA000-memory.dmp

memory/1224-56-0x0000000000360000-0x0000000000382000-memory.dmp

memory/1340-57-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1340-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1340-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1340-62-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1340-64-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1340-67-0x000000000040717B-mapping.dmp

memory/1340-66-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1340-69-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2036-70-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-04-04 03:21

Reported

2022-04-04 03:47

Platform

win10v2004-20220331-en

Max time kernel

84s

Max time network

126s

Command Line

"C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1276 set thread context of 2272 N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

"C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe"

C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

C:\Users\Admin\AppData\Local\Temp\DFI_0451_587_032.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2272 -ip 2272

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2272 -s 232

Network

Country Destination Domain Proto
US 209.197.3.8:80 tcp
US 20.189.173.13:443 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 204.79.197.203:80 tcp

Files

memory/1276-124-0x0000000000AA0000-0x0000000000B00000-memory.dmp

memory/1276-125-0x00000000054F0000-0x0000000005566000-memory.dmp

memory/1276-126-0x0000000005470000-0x000000000548E000-memory.dmp

memory/2272-127-0x0000000000000000-mapping.dmp

memory/2272-128-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2272-129-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2272-130-0x0000000000400000-0x0000000000438000-memory.dmp