Malware Analysis Report

2025-08-11 05:03

Sample ID 241230-e1nyksxrey
Target JaffaCakes118_03d6fa79b7d5bbe9e643da58bb6319f2f2532c7ae616d79d1701ad0e5dc232f8
SHA256 03d6fa79b7d5bbe9e643da58bb6319f2f2532c7ae616d79d1701ad0e5dc232f8
Tags
formbook b3n1 discovery rat spyware stealer trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral4

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

03d6fa79b7d5bbe9e643da58bb6319f2f2532c7ae616d79d1701ad0e5dc232f8

Threat Level: Known bad

The file JaffaCakes118_03d6fa79b7d5bbe9e643da58bb6319f2f2532c7ae616d79d1701ad0e5dc232f8 was found to be: Known bad.

Malicious Activity Summary

formbook b3n1 discovery rat spyware stealer trojan

Formbook family

Formbook

Formbook payload

Loads dropped DLL

Deletes itself

Suspicious use of SetThreadContext

System Location Discovery: System Language Discovery

Program crash

Unsigned PE

Enumerates physical storage devices

NSIS installer

Suspicious behavior: MapViewOfSection

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-30 04:24

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

NSIS installer

installer
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-12-30 04:24

Reported

2024-12-30 04:27

Platform

win7-20240903-en

Max time kernel

146s

Max time network

122s

Command Line

C:\Windows\Explorer.EXE

Signatures

Formbook

trojan spyware stealer formbook

Formbook family

formbook

Formbook payload

rat
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Deletes itself

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Loads dropped DLL

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2112 set thread context of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 2788 set thread context of 1204 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Windows\Explorer.EXE
PID 2932 set thread context of 1204 N/A C:\Windows\SysWOW64\netsh.exe C:\Windows\Explorer.EXE

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\netsh.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\netsh.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2112 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 2112 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 2112 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 2112 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 2112 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 2112 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 2112 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe
PID 1204 wrote to memory of 2932 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\netsh.exe
PID 1204 wrote to memory of 2932 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\netsh.exe
PID 1204 wrote to memory of 2932 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\netsh.exe
PID 1204 wrote to memory of 2932 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\netsh.exe
PID 2932 wrote to memory of 2776 N/A C:\Windows\SysWOW64\netsh.exe C:\Windows\SysWOW64\cmd.exe
PID 2932 wrote to memory of 2776 N/A C:\Windows\SysWOW64\netsh.exe C:\Windows\SysWOW64\cmd.exe
PID 2932 wrote to memory of 2776 N/A C:\Windows\SysWOW64\netsh.exe C:\Windows\SysWOW64\cmd.exe
PID 2932 wrote to memory of 2776 N/A C:\Windows\SysWOW64\netsh.exe C:\Windows\SysWOW64\cmd.exe

Processes

C:\Windows\Explorer.EXE

C:\Windows\Explorer.EXE

C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe

"C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe"

C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe

"C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe"

C:\Windows\SysWOW64\netsh.exe

"C:\Windows\SysWOW64\netsh.exe"

C:\Windows\SysWOW64\cmd.exe

/c del "C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe"

Network

N/A

Files

C:\Users\Admin\AppData\Local\Temp\nsjEF8E.tmp\sydrnwxz.dll

MD5 f50d919a09c776df2c4fa63e3dcd4526
SHA1 917c24b146a6a17ec1cfaebde50199256b4126da
SHA256 f2635ca10d2ad2503eefbbfd4673e9c8ad66f363d0117fc4fbd79554ca482f20
SHA512 5b578e7197b7b584185ea83b91938d4b9f152703c6039f98c096423cf94111e2f7146789dea548a2f317d1abf623356d36b4e047ff1d37835572b84020c89bf2

memory/2112-7-0x0000000010021000-0x0000000010023000-memory.dmp

memory/2788-9-0x0000000000400000-0x000000000042F000-memory.dmp

memory/2788-11-0x0000000000400000-0x000000000042F000-memory.dmp

memory/1204-12-0x00000000040E0000-0x00000000042E0000-memory.dmp

memory/1204-13-0x0000000005230000-0x0000000005356000-memory.dmp

memory/2932-16-0x00000000017A0000-0x00000000017BB000-memory.dmp

memory/2932-18-0x00000000017A0000-0x00000000017BB000-memory.dmp

memory/2932-19-0x0000000000180000-0x00000000001AF000-memory.dmp

memory/1204-20-0x0000000005230000-0x0000000005356000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-30 04:24

Reported

2024-12-30 04:27

Platform

win10v2004-20241007-en

Max time kernel

92s

Max time network

138s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe"

Signatures

Loads dropped DLL

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

Enumerates physical storage devices

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe

"C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe"

C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe

"C:\Users\Admin\AppData\Local\Temp\Payment Copy.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5032 -ip 5032

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 5032 -s 1020

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 85.49.80.91.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nst9D4A.tmp\sydrnwxz.dll

MD5 f50d919a09c776df2c4fa63e3dcd4526
SHA1 917c24b146a6a17ec1cfaebde50199256b4126da
SHA256 f2635ca10d2ad2503eefbbfd4673e9c8ad66f363d0117fc4fbd79554ca482f20
SHA512 5b578e7197b7b584185ea83b91938d4b9f152703c6039f98c096423cf94111e2f7146789dea548a2f317d1abf623356d36b4e047ff1d37835572b84020c89bf2

memory/5032-7-0x0000000010021000-0x0000000010023000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-12-30 04:24

Reported

2024-12-30 04:27

Platform

win7-20240903-en

Max time kernel

117s

Max time network

121s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\sydrnwxz.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\sydrnwxz.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\sydrnwxz.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2708 -s 252

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2024-12-30 04:24

Reported

2024-12-30 04:27

Platform

win10v2004-20241007-en

Max time kernel

93s

Max time network

145s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\sydrnwxz.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 5020 wrote to memory of 1968 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 5020 wrote to memory of 1968 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 5020 wrote to memory of 1968 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\sydrnwxz.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\sydrnwxz.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1968 -ip 1968

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1968 -s 708

Network

Country Destination Domain Proto
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 85.49.80.91.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp

Files

N/A