Analysis Overview
SHA256
d8e6a83561b9d8dbe84de21795763589d2626904ac6406ddfe2dc2342c4edb8e
Threat Level: Known bad
The file nell.scr.exe was found to be: Known bad.
Malicious Activity Summary
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
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
Signatures
Formbook
Formbook payload
| 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 behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
| 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:\Windows\SysWOW64\wscript.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\wscript.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: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\wscript.exe | N/A |
Suspicious use of WriteProcessMemory
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
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
Signatures
Formbook
Formbook payload
| 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
Suspicious behavior: MapViewOfSection
| 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:\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 |
Suspicious use of WriteProcessMemory
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