84d10b6f0f9746db37315a9df09016ab1da5e7c2918c2d0e6ddb90b23cbd6df3

General

Target

Complaint-Letter-1562041087-03102021.xls
Size

276KB
MD5

97f27473726b5df577af145b2c6446c9
SHA1

9c670a3fbad0d5f32913a1d823aeed4210cdb8cd
SHA256

6324f93b071899aefccb5d511efa75ced57554a51ef6c6281cafde5a78febcfc
SHA512

dce62d4d96aaab916b502d0873a70320c71af072b489954555ca3969cb575ca7dcfa29020153f8350b3fad40291861546e0bb0f0f8bf3e8b2abd682e287b47c5

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	4324	4688	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4500	4688	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4480	4688	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4488	4688	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4512	4688	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

4688 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE
4688	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 4688 wrote to memory of 4324	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4324	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4500	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4500	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4480	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4480	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4488	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4488	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4512	4688	EXCEL.EXE	rundll32.exe
PID 4688 wrote to memory of 4512	4688	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-1562041087-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4688

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4324

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4500

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4480

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4488

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4512

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/4324-7-0x0000000000000000-mapping.dmp

Download
memory/4480-9-0x0000000000000000-mapping.dmp

Download
memory/4488-10-0x0000000000000000-mapping.dmp

Download
memory/4500-8-0x0000000000000000-mapping.dmp

Download
memory/4512-11-0x0000000000000000-mapping.dmp

Download
memory/4688-2-0x00007FFEC57A0000-0x00007FFEC57B0000-memory.dmp

Filesize
64KB

Download
memory/4688-3-0x00007FFEC57A0000-0x00007FFEC57B0000-memory.dmp

Filesize
64KB

Download
memory/4688-4-0x00007FFEC57A0000-0x00007FFEC57B0000-memory.dmp

Filesize
64KB

Download
memory/4688-5-0x00007FFEEB200000-0x00007FFEEB837000-memory.dmp

Filesize
6.2MB

Download
memory/4688-6-0x00007FFEC57A0000-0x00007FFEC57B0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads