e81294c9114fd7297a97f004a928a0243d2fe6ac4dc54d2e0f9d3c86d1901c69

General

Target

Complaint-Letter-134691101-03102021.xls
Size

276KB
MD5

3eedeea5f0c97fbed05b86a3aa16ba74
SHA1

fc76baabb3784081779086e584d26f32c27d190f
SHA256

e81294c9114fd7297a97f004a928a0243d2fe6ac4dc54d2e0f9d3c86d1901c69
SHA512

7343013d614a593343dfcd6d04ca76e2ddd08fb57e02f54ca8ee257a40d31c1637b41277863ca473760f3b56fa7f1835c349c761e3bc9a3914ad34045cc24a47

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	1180	672	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1936	672	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3836	672	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3968	672	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1664	672	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

672 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

672 EXCEL.EXE
672 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE
672	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 672 wrote to memory of 1180	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 1180	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 1936	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 1936	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 3836	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 3836	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 3968	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 3968	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 1664	672	EXCEL.EXE	rundll32.exe
PID 672 wrote to memory of 1664	672	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-134691101-03102021.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:672
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1180
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok1,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1936
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok2,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:3836
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok3,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:3968
- C:\Windows\SYSTEM32\rundll32.exe
  rundll32 ..\Runtime.brok4,DllRegisterServer
  2⤵
  - Process spawned unexpected child process
  PID:1664

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

C:\Users\Admin\Runtime.brok1

MD5
153665460fe2578e8dc4e36ef7077d80

SHA1
40a90b6f98c358bdbdd6e5842c186d919cdde7e3

SHA256
3ad4b3ff863a1ff41ea1e6ebb34f374a8d54804ec27b5531d05e579374bd602b

SHA512
31abced5777e4c5dd3f155fbda068ab786a57e0d24cb535d41379c471011a6ac757f2ad4802c52249b3280065c4ce31e3a7f932637d8ee37adbccdab3a2bf2f8

Download Submit
memory/672-2-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/672-3-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/672-4-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/672-5-0x00007FF8519F0000-0x00007FF852027000-memory.dmp

Filesize
6.2MB

Download
memory/672-6-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/1180-7-0x0000000000000000-mapping.dmp

Download
memory/1664-12-0x0000000000000000-mapping.dmp

Download
memory/1936-8-0x0000000000000000-mapping.dmp

Download
memory/3836-10-0x0000000000000000-mapping.dmp

Download
memory/3968-11-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads