Malware Analysis Report

2024-10-23 22:11

Sample ID 240717-ldl9ssxemf
Target nell.scr.exe
SHA256 d8e6a83561b9d8dbe84de21795763589d2626904ac6406ddfe2dc2342c4edb8e
Tags
formbook btrd rat spyware stealer trojan
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

d8e6a83561b9d8dbe84de21795763589d2626904ac6406ddfe2dc2342c4edb8e

Threat Level: Known bad

The file nell.scr.exe was found to be: Known bad.

Malicious Activity Summary

formbook btrd rat spyware stealer trojan

Formbook

Formbook payload

Deletes itself

Suspicious use of SetThreadContext

Unsigned PE

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Modifies registry class

Suspicious use of UnmapMainImage

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-07-17 09:25

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-07-17 09:25

Reported

2024-07-17 09:27

Platform

win7-20240708-en

Max time kernel

147s

Max time network

126s

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 2556 set thread context of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 1612 set thread context of 1172 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Windows\Explorer.EXE
PID 2488 set thread context of 1172 N/A C:\Windows\SysWOW64\wscript.exe C:\Windows\Explorer.EXE

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\wscript.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2556 wrote to memory of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 2556 wrote to memory of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 2556 wrote to memory of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 2556 wrote to memory of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 2556 wrote to memory of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 2556 wrote to memory of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 2556 wrote to memory of 1612 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 1172 wrote to memory of 2488 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\wscript.exe
PID 1172 wrote to memory of 2488 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\wscript.exe
PID 1172 wrote to memory of 2488 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\wscript.exe
PID 1172 wrote to memory of 2488 N/A C:\Windows\Explorer.EXE C:\Windows\SysWOW64\wscript.exe
PID 2488 wrote to memory of 2860 N/A C:\Windows\SysWOW64\wscript.exe C:\Windows\SysWOW64\cmd.exe
PID 2488 wrote to memory of 2860 N/A C:\Windows\SysWOW64\wscript.exe C:\Windows\SysWOW64\cmd.exe
PID 2488 wrote to memory of 2860 N/A C:\Windows\SysWOW64\wscript.exe C:\Windows\SysWOW64\cmd.exe
PID 2488 wrote to memory of 2860 N/A C:\Windows\SysWOW64\wscript.exe C:\Windows\SysWOW64\cmd.exe

Processes

C:\Windows\Explorer.EXE

C:\Windows\Explorer.EXE

C:\Users\Admin\AppData\Local\Temp\nell.scr.exe

"C:\Users\Admin\AppData\Local\Temp\nell.scr.exe"

C:\Users\Admin\AppData\Local\Temp\nell.scr.exe

"C:\Users\Admin\AppData\Local\Temp\nell.scr.exe"

C:\Windows\SysWOW64\wscript.exe

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

C:\Windows\SysWOW64\cmd.exe

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

Network

N/A

Files

memory/2556-0-0x0000000073D0E000-0x0000000073D0F000-memory.dmp

memory/2556-1-0x00000000009A0000-0x0000000000A40000-memory.dmp

memory/2556-2-0x0000000004160000-0x00000000041C2000-memory.dmp

memory/2556-3-0x0000000073D00000-0x00000000743EE000-memory.dmp

memory/2556-4-0x0000000000430000-0x0000000000438000-memory.dmp

memory/1612-9-0x0000000000400000-0x000000000042F000-memory.dmp

memory/1612-7-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/1612-6-0x0000000000400000-0x000000000042F000-memory.dmp

memory/1612-5-0x0000000000400000-0x000000000042F000-memory.dmp

memory/1612-10-0x0000000000A40000-0x0000000000D43000-memory.dmp

memory/1172-15-0x0000000004ED0000-0x0000000004FE0000-memory.dmp

memory/1612-14-0x0000000000160000-0x0000000000174000-memory.dmp

memory/1612-13-0x0000000000400000-0x000000000042F000-memory.dmp

memory/2556-16-0x0000000073D00000-0x00000000743EE000-memory.dmp

memory/2488-17-0x00000000003D0000-0x00000000003F6000-memory.dmp

memory/2488-19-0x00000000003D0000-0x00000000003F6000-memory.dmp

memory/2488-20-0x0000000000070000-0x000000000009F000-memory.dmp

memory/1172-22-0x0000000004ED0000-0x0000000004FE0000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-07-17 09:25

Reported

2024-07-17 09:27

Platform

win10v2004-20240704-en

Max time kernel

149s

Max time network

152s

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 532 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Users\Admin\AppData\Local\Temp\nell.scr.exe
PID 532 set thread context of 3464 N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe C:\Windows\Explorer.EXE
PID 4680 set thread context of 3464 N/A C:\Windows\SysWOW64\msdt.exe C:\Windows\Explorer.EXE

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-1403246978-718555486-3105247137-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\ C:\Windows\Explorer.EXE N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\ C:\Windows\Explorer.EXE N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A
N/A N/A C:\Windows\SysWOW64\msdt.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\nell.scr.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
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\msdt.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

Processes

C:\Windows\Explorer.EXE

C:\Windows\Explorer.EXE

C:\Users\Admin\AppData\Local\Temp\nell.scr.exe

"C:\Users\Admin\AppData\Local\Temp\nell.scr.exe"

C:\Users\Admin\AppData\Local\Temp\nell.scr.exe

"C:\Users\Admin\AppData\Local\Temp\nell.scr.exe"

C:\Windows\SysWOW64\msdt.exe

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

C:\Windows\SysWOW64\cmd.exe

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

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 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 0.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 www.jiuguanwang.net udp
HK 38.6.207.210:80 www.jiuguanwang.net tcp
US 8.8.8.8:53 210.207.6.38.in-addr.arpa udp
US 8.8.8.8:53 www.rd8.online udp
DE 185.53.177.51:80 www.rd8.online tcp
US 8.8.8.8:53 51.177.53.185.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 www.home-repair-contractors-kfm.xyz udp
US 199.59.243.226:80 www.home-repair-contractors-kfm.xyz tcp
US 8.8.8.8:53 226.243.59.199.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.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.thebestanglephotography.online udp
US 66.96.162.131:80 www.thebestanglephotography.online tcp
US 8.8.8.8:53 131.162.96.66.in-addr.arpa udp
US 8.8.8.8:53 www.8129k.vip udp
US 15.197.148.33:80 www.8129k.vip tcp
US 8.8.8.8:53 33.148.197.15.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

memory/3064-0-0x0000000074C4E000-0x0000000074C4F000-memory.dmp

memory/3064-1-0x0000000000B40000-0x0000000000BE0000-memory.dmp

memory/3064-2-0x0000000005AA0000-0x0000000006044000-memory.dmp

memory/3064-3-0x00000000055D0000-0x0000000005662000-memory.dmp

memory/3064-4-0x0000000074C40000-0x00000000753F0000-memory.dmp

memory/3064-5-0x00000000057E0000-0x00000000057EA000-memory.dmp

memory/3064-6-0x0000000005820000-0x0000000005882000-memory.dmp

memory/3064-7-0x0000000005940000-0x00000000059DC000-memory.dmp

memory/3064-8-0x0000000005890000-0x0000000005898000-memory.dmp

memory/532-9-0x0000000000400000-0x000000000042F000-memory.dmp

memory/532-10-0x00000000010A0000-0x00000000013EA000-memory.dmp

memory/532-13-0x00000000015C0000-0x00000000015D4000-memory.dmp

memory/3464-14-0x0000000008D10000-0x0000000008EB1000-memory.dmp

memory/532-12-0x0000000000400000-0x000000000042F000-memory.dmp

memory/3064-16-0x0000000074C40000-0x00000000753F0000-memory.dmp

memory/4680-17-0x00000000005C0000-0x0000000000617000-memory.dmp

memory/4680-18-0x00000000005C0000-0x0000000000617000-memory.dmp

memory/4680-19-0x0000000000760000-0x000000000078F000-memory.dmp

memory/3464-21-0x0000000008D10000-0x0000000008EB1000-memory.dmp

memory/3464-24-0x0000000002F60000-0x0000000003059000-memory.dmp

memory/3464-25-0x0000000002F60000-0x0000000003059000-memory.dmp

memory/3464-28-0x0000000002F60000-0x0000000003059000-memory.dmp