4ce84c7097fafe010daa73dda77ff17662086505e23b8d4bd11692c9d47896df

General

Target

Complaint-Letter-1839904529-03102021.xls
Size

276KB
MD5

d1b22a745d5efffef5c52928b7f439d6
SHA1

ba3a1a876978ebdb2a631f644a6b686fafc3c7a3
SHA256

4ce84c7097fafe010daa73dda77ff17662086505e23b8d4bd11692c9d47896df
SHA512

0cd10c652a13d1c73da064896e145a7fcc8773cad9e098678bfbe9be7543a81e7b616cd74826d78ebd36ec5842bd27c580c15d5a36109209a26402716a9242ff

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	2744	3564	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3032	3564	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3492	3564	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3824	3564	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1020	3564	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

3564 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

3564 EXCEL.EXE
3564 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE
3564	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 3564 wrote to memory of 2744	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 2744	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 3032	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 3032	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 3492	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 3492	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 3824	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 3824	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 1020	3564	EXCEL.EXE	rundll32.exe
PID 3564 wrote to memory of 1020	3564	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-1839904529-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3564
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:2744
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok1,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:3032
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok2,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:3492
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok3,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:3824
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok4,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1020

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1020-11-0x0000000000000000-mapping.dmp

Download
memory/2744-7-0x0000000000000000-mapping.dmp

Download
memory/3032-8-0x0000000000000000-mapping.dmp

Download
memory/3492-9-0x0000000000000000-mapping.dmp

Download
memory/3564-2-0x00007FFC7E0E0000-0x00007FFC7E0F0000-memory.dmp

Filesize
64KB

Download
memory/3564-3-0x00007FFC7E0E0000-0x00007FFC7E0F0000-memory.dmp

Filesize
64KB

Download
memory/3564-4-0x00007FFC7E0E0000-0x00007FFC7E0F0000-memory.dmp

Filesize
64KB

Download
memory/3564-6-0x00007FFC7E0E0000-0x00007FFC7E0F0000-memory.dmp

Filesize
64KB

Download
memory/3564-5-0x00007FFCA1730000-0x00007FFCA1D67000-memory.dmp

Filesize
6.2MB

Download
memory/3824-10-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads