9c0656e6e8de2c3dc70989d4c563d3f250bc81bb1598cff78e0ec72aa854176a

General

Target

Complaint-Letter-2050692395-03102021.xls
Size

281KB
MD5

1defa9216b9455154b38c0775991e30f
SHA1

b35e76b7ae9b2aaf253a44c6d3a8500b41458818
SHA256

9c0656e6e8de2c3dc70989d4c563d3f250bc81bb1598cff78e0ec72aa854176a
SHA512

d958e8f5dbc1dee799e08ed8ec331702d2ad289b241fd90b1f7df3b055122af230c611ab4078dbc7bf8bf6f92812a41b2e703a5321027ec84afc86cdf0168d07

Score

10^/10

Malware Config

Signatures

Process spawned unexpected child process 5 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

rundll32.exerundll32.exerundll32.exerundll32.exerundll32.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1252	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2924	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1080	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3440	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3840	1456	rundll32.exe	EXCEL.EXE

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1456 EXCEL.EXE

Suspicious use of SetWindowsHookEx 19 IoCs

Processes:

EXCEL.EXE

pid	process
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1456 wrote to memory of 1252	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 1252	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 2924	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 2924	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 1080	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 1080	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3440	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3440	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3840	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3840	1456	EXCEL.EXE	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Complaint-Letter-2050692395-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1456

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1252

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2924

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1080

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3440

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3840

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/1080-9-0x0000000000000000-mapping.dmp

Download
memory/1252-7-0x0000000000000000-mapping.dmp

Download
memory/1456-2-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/1456-3-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/1456-4-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/1456-5-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/1456-6-0x00007FFB568F0000-0x00007FFB56F27000-memory.dmp

Filesize
6.2MB

Download
memory/2924-8-0x0000000000000000-mapping.dmp

Download
memory/3440-10-0x0000000000000000-mapping.dmp

Download
memory/3840-11-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads