Malware Analysis Report

2025-01-03 04:58

Sample ID 220411-dmmmxsbea4
Target FLP_1037850047.pdf
SHA256 a59fbc4f9903ed18c989e87bc83073b463310ffe6c90a43c53400739719d0aae
Tags
oski infostealer spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

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

a59fbc4f9903ed18c989e87bc83073b463310ffe6c90a43c53400739719d0aae

Threat Level: Known bad

The file FLP_1037850047.pdf was found to be: Known bad.

Malicious Activity Summary

oski infostealer spyware stealer

Oski

Reads user/profile data of web browsers

Suspicious use of SetThreadContext

Program crash

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2022-04-11 03:07

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-04-11 03:07

Reported

2022-04-11 03:31

Platform

win7-20220310-en

Max time kernel

4294182s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe"

Signatures

Oski

infostealer oski

Reads user/profile data of web browsers

spyware stealer

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 964 set thread context of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 964 wrote to memory of 1116 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe
PID 1116 wrote to memory of 768 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Windows\SysWOW64\WerFault.exe
PID 1116 wrote to memory of 768 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Windows\SysWOW64\WerFault.exe
PID 1116 wrote to memory of 768 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Windows\SysWOW64\WerFault.exe
PID 1116 wrote to memory of 768 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

"C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe"

C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1116 -s 788

Network

Country Destination Domain Proto
US 8.8.8.8:53 duiy.xyz udp

Files

memory/964-54-0x0000000000C40000-0x0000000000CA2000-memory.dmp

memory/964-55-0x00000000003A0000-0x00000000003AA000-memory.dmp

memory/964-56-0x0000000000500000-0x0000000000522000-memory.dmp

memory/1116-57-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1116-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1116-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1116-62-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1116-64-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1116-67-0x000000000040717B-mapping.dmp

memory/1116-66-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1116-69-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1116-70-0x00000000758A1000-0x00000000758A3000-memory.dmp

memory/1116-71-0x0000000000400000-0x0000000000438000-memory.dmp

memory/768-72-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-04-11 03:07

Reported

2022-04-11 03:31

Platform

win10v2004-20220310-en

Max time kernel

139s

Max time network

154s

Command Line

"C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe"

Signatures

Oski

infostealer oski

Reads user/profile data of web browsers

spyware stealer

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2088 set thread context of 4544 N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

"C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe"

C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

C:\Users\Admin\AppData\Local\Temp\FLP_1037850047.exe

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4544 -ip 4544

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4544 -s 1308

Network

Country Destination Domain Proto
US 8.8.8.8:53 duiy.xyz udp

Files

memory/2088-134-0x0000000000C20000-0x0000000000C82000-memory.dmp

memory/2088-135-0x00000000056D0000-0x0000000005746000-memory.dmp

memory/2088-136-0x0000000005650000-0x000000000566E000-memory.dmp

memory/4544-137-0x0000000000000000-mapping.dmp

memory/4544-138-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4544-139-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4544-140-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4544-141-0x0000000000400000-0x0000000000438000-memory.dmp