Malware Analysis Report

2025-01-03 04:56

Sample ID 220329-wyhr8ahee4
Target 74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40
SHA256 74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40
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

74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40

Threat Level: Known bad

The file 74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40 was found to be: Known bad.

Malicious Activity Summary

oski infostealer

Oski

Suspicious use of SetThreadContext

Program crash

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2022-03-29 18:19

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-03-29 18:19

Reported

2022-03-31 15:09

Platform

win7-20220311-en

Max time kernel

4294183s

Max time network

147s

Command Line

"C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1968 set thread context of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 1968 wrote to memory of 676 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 676 wrote to memory of 540 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 676 wrote to memory of 540 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 676 wrote to memory of 540 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe
PID 676 wrote to memory of 540 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe

"C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 112

Network

Country Destination Domain Proto
NL 216.58.208.98:443 tcp
NL 216.58.208.98:443 tcp
NL 216.58.208.97:443 tcp
NL 142.250.179.163:80 tcp
NL 216.58.208.97:443 tcp
NL 142.250.179.163:80 tcp
NL 142.250.179.132:443 tcp
US 8.238.111.126:80 tcp
US 8.238.111.126:80 tcp
US 3.211.228.79:443 tcp
US 35.186.238.101:80 tcp
US 35.186.238.101:80 tcp
US 35.186.238.101:80 tcp

Files

memory/1968-54-0x0000000000060000-0x000000000011A000-memory.dmp

memory/1968-55-0x0000000002140000-0x000000000218C000-memory.dmp

memory/1968-56-0x0000000000600000-0x000000000061C000-memory.dmp

memory/676-57-0x0000000000400000-0x0000000000438000-memory.dmp

memory/676-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/676-60-0x0000000000400000-0x0000000000438000-memory.dmp

memory/676-62-0x0000000000400000-0x0000000000438000-memory.dmp

memory/676-64-0x0000000000400000-0x0000000000438000-memory.dmp

memory/676-66-0x0000000000400000-0x0000000000438000-memory.dmp

memory/676-67-0x000000000040717B-mapping.dmp

memory/676-69-0x0000000000400000-0x0000000000438000-memory.dmp

memory/540-70-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-03-29 18:19

Reported

2022-03-31 15:10

Platform

win10v2004-20220310-en

Max time kernel

140s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3668 set thread context of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
PID 3668 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

Processes

C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe

"C:\Users\Admin\AppData\Local\Temp\74c0613165375c4ecc81a4398a0971f4e497e3f1f7f1f0987100af4565991b40.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3980 -ip 3980

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3980 -s 188

Network

Country Destination Domain Proto
NL 104.80.225.205:443 tcp
NL 104.110.191.133:80 tcp
NL 104.110.191.133:80 tcp
US 8.238.20.254:80 tcp

Files

memory/3668-134-0x00000000005B0000-0x000000000066A000-memory.dmp

memory/3668-135-0x0000000005630000-0x0000000005BD4000-memory.dmp

memory/3668-136-0x0000000005080000-0x0000000005112000-memory.dmp

memory/3668-137-0x0000000005020000-0x000000000502A000-memory.dmp

memory/3980-138-0x0000000000000000-mapping.dmp

memory/3980-139-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3980-140-0x0000000000400000-0x0000000000438000-memory.dmp

memory/3980-141-0x0000000000400000-0x0000000000438000-memory.dmp