Malware Analysis Report

2025-01-03 04:56

Sample ID 220407-2yzzdsaffm
Target F072-01953382-ESERMUL.exe
SHA256 48d338ba06ada3da080eeeddb8a267b1b677dc9c3670f13e333ec8c73ff1b02c
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

48d338ba06ada3da080eeeddb8a267b1b677dc9c3670f13e333ec8c73ff1b02c

Threat Level: Known bad

The file F072-01953382-ESERMUL.exe 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

2022-04-07 23:00

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-04-07 23:00

Reported

2022-04-07 23:02

Platform

win7-20220310-en

Max time kernel

4294178s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1588 set thread context of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1588 wrote to memory of 1884 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe
PID 1884 wrote to memory of 2000 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Windows\SysWOW64\WerFault.exe
PID 1884 wrote to memory of 2000 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Windows\SysWOW64\WerFault.exe
PID 1884 wrote to memory of 2000 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Windows\SysWOW64\WerFault.exe
PID 1884 wrote to memory of 2000 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Windows\SysWOW64\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe

"C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe"

C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe

"C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1884 -s 112

Network

N/A

Files

memory/1588-54-0x0000000001000000-0x0000000001086000-memory.dmp

memory/1588-55-0x0000000000470000-0x000000000047A000-memory.dmp

memory/1588-56-0x0000000005470000-0x00000000054EA000-memory.dmp

memory/1588-57-0x0000000000CA0000-0x0000000000CD8000-memory.dmp

memory/1884-58-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1884-59-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1884-61-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1884-63-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1884-65-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1884-68-0x000000000040717B-mapping.dmp

memory/1884-67-0x0000000000400000-0x0000000000438000-memory.dmp

memory/1884-70-0x0000000000400000-0x0000000000438000-memory.dmp

memory/2000-71-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-04-07 23:00

Reported

2022-04-07 23:02

Platform

win10v2004-20220331-en

Max time kernel

117s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe"

Signatures

Oski

infostealer oski

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2468 set thread context of 4648 N/A C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe

Processes

C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe

"C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe"

C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe

"C:\Users\Admin\AppData\Local\Temp\F072-01953382-ESERMUL.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4648 -ip 4648

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4648 -s 232

Network

Country Destination Domain Proto
US 209.197.3.8:80 tcp
US 93.184.220.29:80 tcp
FI 62.115.252.112:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 93.184.220.29:80 tcp
NL 20.190.160.131:443 tcp
US 8.8.8.8:53 crl4.digicert.com udp
US 93.184.220.29:80 crl4.digicert.com tcp
US 93.184.220.29:80 crl4.digicert.com tcp
US 209.197.3.8:80 tcp
US 20.189.173.10:443 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 209.197.3.8:80 tcp
US 93.184.220.29:80 crl4.digicert.com tcp
US 93.184.220.29:80 crl4.digicert.com tcp
US 204.79.197.203:80 tcp
US 8.8.8.8:53 176.122.125.40.in-addr.arpa udp

Files

memory/2468-124-0x0000000000070000-0x00000000000F6000-memory.dmp

memory/2468-125-0x0000000005040000-0x00000000055E4000-memory.dmp

memory/2468-126-0x0000000004A90000-0x0000000004B22000-memory.dmp

memory/2468-127-0x0000000004BD0000-0x0000000004C6C000-memory.dmp

memory/2468-128-0x0000000004B40000-0x0000000004B4A000-memory.dmp

memory/2468-129-0x00000000071D0000-0x0000000007236000-memory.dmp

memory/4648-130-0x0000000000000000-mapping.dmp

memory/4648-131-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4648-132-0x0000000000400000-0x0000000000438000-memory.dmp

memory/4648-133-0x0000000000400000-0x0000000000438000-memory.dmp