Malware Analysis Report

2025-01-18 12:23

Sample ID 240829-vbgqza1fmg
Target MEmpEng.exe
SHA256 14d4d6df33e96af2a1d5ef8f8e7f6f1b914b0342b219c75f812848f52bc27628
Tags
formbook b48n 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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

14d4d6df33e96af2a1d5ef8f8e7f6f1b914b0342b219c75f812848f52bc27628

Threat Level: Known bad

The file MEmpEng.exe was found to be: Known bad.

Malicious Activity Summary

formbook b48n discovery rat spyware stealer trojan

Formbook

Formbook payload

Deletes itself

Suspicious use of SetThreadContext

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of UnmapMainImage

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Gathers network information

Modifies registry class

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-29 16:48

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-29 16:48

Reported

2024-08-29 16:51

Platform

win10v2004-20240802-en

Max time kernel

149s

Max time network

135s

Command Line

C:\Windows\Explorer.EXE

Signatures

Formbook

trojan spyware stealer 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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3064 set thread context of 4240 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 4240 set thread context of 3552 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Windows\Explorer.EXE
PID 60 set thread context of 3552 N/A C:\Windows\SysWOW64\raserver.exe C:\Windows\Explorer.EXE

System Location Discovery: System Language Discovery

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

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\ C:\Windows\Explorer.EXE N/A
Key created \REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\ C:\Windows\Explorer.EXE N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A
N/A N/A C:\Windows\SysWOW64\raserver.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\raserver.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\Explorer.EXE N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\Explorer.EXE N/A
Token: SeShutdownPrivilege N/A C:\Windows\Explorer.EXE N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\Explorer.EXE N/A

Suspicious use of UnmapMainImage

Description Indicator Process Target
N/A N/A C:\Windows\Explorer.EXE N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3064 wrote to memory of 1540 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 1540 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 1540 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 4240 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 4240 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 4240 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 4240 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 4240 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3064 wrote to memory of 4240 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 3552 wrote to memory of 60 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\raserver.exe
PID 3552 wrote to memory of 60 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\raserver.exe
PID 3552 wrote to memory of 60 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\raserver.exe
PID 60 wrote to memory of 3308 N/A C:\Windows\SysWOW64\raserver.exe C:\Windows\SysWOW64\cmd.exe
PID 60 wrote to memory of 3308 N/A C:\Windows\SysWOW64\raserver.exe C:\Windows\SysWOW64\cmd.exe
PID 60 wrote to memory of 3308 N/A C:\Windows\SysWOW64\raserver.exe C:\Windows\SysWOW64\cmd.exe

Processes

C:\Windows\Explorer.EXE

C:\Windows\Explorer.EXE

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

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

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

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

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

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

C:\Windows\SysWOW64\raserver.exe

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

C:\Windows\SysWOW64\cmd.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 65.139.73.23.in-addr.arpa udp
US 8.8.8.8:53 www.ffg7.autos udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 www.ianju-ljef097.vip udp
US 8.8.8.8:53 www.t83t56zshegbbo.sbs udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 www.5571.club udp
US 8.8.8.8:53 www.yai54.top udp

Files

memory/3064-0-0x000000007466E000-0x000000007466F000-memory.dmp

memory/3064-1-0x0000000000640000-0x00000000006DC000-memory.dmp

memory/3064-2-0x0000000005750000-0x0000000005CF4000-memory.dmp

memory/3064-3-0x00000000050B0000-0x0000000005142000-memory.dmp

memory/3064-4-0x0000000074660000-0x0000000074E10000-memory.dmp

memory/3064-5-0x00000000052F0000-0x00000000052FA000-memory.dmp

memory/3064-6-0x0000000007E10000-0x0000000007E28000-memory.dmp

memory/3064-7-0x000000007466E000-0x000000007466F000-memory.dmp

memory/3064-8-0x0000000074660000-0x0000000074E10000-memory.dmp

memory/3064-9-0x0000000006400000-0x0000000006476000-memory.dmp

memory/3064-10-0x0000000006660000-0x00000000066FC000-memory.dmp

memory/4240-11-0x0000000000400000-0x000000000042F000-memory.dmp

memory/3064-13-0x0000000074660000-0x0000000074E10000-memory.dmp

memory/4240-14-0x0000000000F10000-0x000000000125A000-memory.dmp

memory/4240-17-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

memory/4240-16-0x0000000000400000-0x000000000042F000-memory.dmp

memory/3552-18-0x0000000007F70000-0x0000000008033000-memory.dmp

memory/60-19-0x00000000007E0000-0x00000000007FF000-memory.dmp

memory/60-21-0x00000000007E0000-0x00000000007FF000-memory.dmp

memory/60-22-0x0000000001000000-0x000000000102F000-memory.dmp

memory/3552-23-0x0000000007F70000-0x0000000008033000-memory.dmp

memory/3552-27-0x0000000007860000-0x00000000078F8000-memory.dmp

memory/3552-28-0x0000000007860000-0x00000000078F8000-memory.dmp

memory/3552-30-0x0000000007860000-0x00000000078F8000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-29 16:48

Reported

2024-08-29 16:51

Platform

win7-20240708-en

Max time kernel

147s

Max time network

123s

Command Line

C:\Windows\Explorer.EXE

Signatures

Formbook

trojan spyware stealer 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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2500 set thread context of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2888 set thread context of 1196 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Windows\Explorer.EXE
PID 2800 set thread context of 1196 N/A C:\Windows\SysWOW64\NETSTAT.EXE C:\Windows\Explorer.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\MEmpEng.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\NETSTAT.EXE N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Gathers network information

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\NETSTAT.EXE N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\NETSTAT.EXE N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2500 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2084 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 2500 wrote to memory of 2888 N/A C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe C:\Users\Admin\AppData\Local\Temp\MEmpEng.exe
PID 1196 wrote to memory of 2800 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\NETSTAT.EXE
PID 1196 wrote to memory of 2800 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\NETSTAT.EXE
PID 1196 wrote to memory of 2800 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\NETSTAT.EXE
PID 1196 wrote to memory of 2800 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\NETSTAT.EXE
PID 2800 wrote to memory of 1812 N/A C:\Windows\SysWOW64\NETSTAT.EXE C:\Windows\SysWOW64\cmd.exe
PID 2800 wrote to memory of 1812 N/A C:\Windows\SysWOW64\NETSTAT.EXE C:\Windows\SysWOW64\cmd.exe
PID 2800 wrote to memory of 1812 N/A C:\Windows\SysWOW64\NETSTAT.EXE C:\Windows\SysWOW64\cmd.exe
PID 2800 wrote to memory of 1812 N/A C:\Windows\SysWOW64\NETSTAT.EXE C:\Windows\SysWOW64\cmd.exe

Processes

C:\Windows\Explorer.EXE

C:\Windows\Explorer.EXE

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

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

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

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

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

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

C:\Windows\SysWOW64\NETSTAT.EXE

"C:\Windows\SysWOW64\NETSTAT.EXE"

C:\Windows\SysWOW64\cmd.exe

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

Network

N/A

Files

memory/2500-0-0x000000007441E000-0x000000007441F000-memory.dmp

memory/2500-1-0x00000000002B0000-0x000000000034C000-memory.dmp

memory/2500-2-0x0000000074410000-0x0000000074AFE000-memory.dmp

memory/2500-3-0x00000000008C0000-0x00000000008D8000-memory.dmp

memory/2500-4-0x000000007441E000-0x000000007441F000-memory.dmp

memory/2500-5-0x0000000074410000-0x0000000074AFE000-memory.dmp

memory/2500-6-0x0000000005050000-0x00000000050C6000-memory.dmp

memory/2888-7-0x0000000000400000-0x000000000042F000-memory.dmp

memory/2888-9-0x0000000000400000-0x000000000042F000-memory.dmp

memory/2888-13-0x0000000000400000-0x000000000042F000-memory.dmp

memory/2888-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2500-14-0x0000000074410000-0x0000000074AFE000-memory.dmp

memory/2888-15-0x00000000009E0000-0x0000000000CE3000-memory.dmp

memory/1196-17-0x0000000003B50000-0x0000000003C50000-memory.dmp

memory/2888-19-0x0000000000280000-0x0000000000295000-memory.dmp

memory/1196-20-0x0000000005030000-0x00000000051A8000-memory.dmp

memory/2888-18-0x0000000000400000-0x000000000042F000-memory.dmp

memory/2800-21-0x00000000004F0000-0x00000000004F9000-memory.dmp

memory/2800-22-0x00000000004F0000-0x00000000004F9000-memory.dmp

memory/2800-23-0x0000000000130000-0x000000000015F000-memory.dmp

memory/1196-24-0x0000000005030000-0x00000000051A8000-memory.dmp