10dcbbb94986d7078525942a32e1ce7a5994db855d91dfb6bc0af4454c275d00

General

Target

Complaint-Letter-641255205-03102021.xls
Size

281KB
MD5

e0ba5c610d3096ff98c2ff1d683b7f8e
SHA1

cf72fda2892d65a37e710de892672ba75ade3694
SHA256

f27b807a56b6166eb9ae91a78ecfbf9abba29fa83970ff81c2ae23aa67df3eae
SHA512

97597ccf03e75ddbef2e7f9b25121767dc3a8fb7346f9209cfbfc639449e05edf2832f67ec64e3e8e3e9a60fe820c22b069a39d961abe3ac4bfb579ffa3e2a17

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	3812	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3796	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2840	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3880	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2856	576	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\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	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

576 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE
576	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 576 wrote to memory of 3812	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3812	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3796	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3796	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 2840	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 2840	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3880	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3880	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 2856	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 2856	576	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-641255205-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:576

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3812

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3796

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2840

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3880

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2856

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/576-2-0x00007FFE76A80000-0x00007FFE76A90000-memory.dmp

Filesize
64KB

Download
memory/576-3-0x00007FFE76A80000-0x00007FFE76A90000-memory.dmp

Filesize
64KB

Download
memory/576-4-0x00007FFE76A80000-0x00007FFE76A90000-memory.dmp

Filesize
64KB

Download
memory/576-5-0x00007FFE76A80000-0x00007FFE76A90000-memory.dmp

Filesize
64KB

Download
memory/576-6-0x00007FFE999A0000-0x00007FFE99FD7000-memory.dmp

Filesize
6.2MB

Download
memory/2840-9-0x0000000000000000-mapping.dmp

Download
memory/2856-11-0x0000000000000000-mapping.dmp

Download
memory/3796-8-0x0000000000000000-mapping.dmp

Download
memory/3812-7-0x0000000000000000-mapping.dmp

Download
memory/3880-10-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads