e3419e17335cdbcd018cb67aeb3475c7513496d2ddd12b5e5dbc50ad464e87ef

General

Target

Complaint-Letter-1768077996-03102021.xls
Size

276KB
MD5

122e75358ae9db054aa4843ee1543db9
SHA1

d459af154bdd0f606a378a40cbca16c0b8246a00
SHA256

fd3ceedd03ccec43d6569d2b8a9e961d8ef63ea331143a4ca9da1b780807053e
SHA512

529d0ba46ac7ca77a02b4a2a26bda4e113fddf42fe0f9bbc56dd7e59cea69d5b158ece8ef35e26d11b1a5ca88a99e1b6179763da2bb22e7539a01622be5a98a8

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	4068	492	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	512	492	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1392	492	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2120	492	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3044	492	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 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
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	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

492 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

492 EXCEL.EXE
492 EXCEL.EXE

Suspicious use of SetWindowsHookEx 21 IoCs

Processes:

EXCEL.EXE

pid	process
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE
492	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 492 wrote to memory of 4068	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 4068	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 512	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 512	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 1392	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 1392	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 2120	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 2120	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 3044	492	EXCEL.EXE	rundll32.exe
PID 492 wrote to memory of 3044	492	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-1768077996-03102021.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:492
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:4068
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok1,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:512
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok2,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1392
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok3,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:2120
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok4,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:3044

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/492-2-0x00007FF9F0570000-0x00007FF9F0580000-memory.dmp

Filesize
64KB

Download
memory/492-3-0x00007FF9F0570000-0x00007FF9F0580000-memory.dmp

Filesize
64KB

Download
memory/492-4-0x00007FF9F0570000-0x00007FF9F0580000-memory.dmp

Filesize
64KB

Download
memory/492-5-0x00007FFA144B0000-0x00007FFA14AE7000-memory.dmp

Filesize
6.2MB

Download
memory/492-6-0x00007FF9F0570000-0x00007FF9F0580000-memory.dmp

Filesize
64KB

Download
memory/512-8-0x0000000000000000-mapping.dmp

Download
memory/1392-9-0x0000000000000000-mapping.dmp

Download
memory/2120-10-0x0000000000000000-mapping.dmp

Download
memory/3044-11-0x0000000000000000-mapping.dmp

Download
memory/4068-7-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads