061cc686cc419c20be9207dc08cf30387e4dd3ad689f75769f15901848f4745d

General

Target

Complaint-Letter-1737783681-03102021.xls
Size

276KB
MD5

a43af9b5594cb1cfd748e6a4a33c3dc7
SHA1

8856a2c2c6975693a2ec9f603aba226596e74d55
SHA256

69c60296879563e341e1dba8da2f421893ad9697593a5deeaff3e79abb57dd9a
SHA512

d74ec67a73d4fb87cdbdf5978a7953058004f6f7dd49cc4e5dc12e5eb331388f020fc409b9b6e79056b18c2fa9262e19ab1ffe3321376798f808bac0c3b9f83d

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	2404	1144	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4072	1144	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3412	1144	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2768	1144	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3804	1144	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

1144 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

1144 EXCEL.EXE
1144 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE
1144	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1144 wrote to memory of 2404	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 2404	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 4072	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 4072	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 3412	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 3412	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 2768	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 2768	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 3804	1144	EXCEL.EXE	rundll32.exe
PID 1144 wrote to memory of 3804	1144	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-1737783681-03102021.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:1144

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2404

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4072

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3412

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2768

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3804

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

Replay Monitor

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Downloads

C:\Users\Admin\Runtime.brok1
MD5
153665460fe2578e8dc4e36ef7077d80

SHA1
40a90b6f98c358bdbdd6e5842c186d919cdde7e3

SHA256
3ad4b3ff863a1ff41ea1e6ebb34f374a8d54804ec27b5531d05e579374bd602b

SHA512
31abced5777e4c5dd3f155fbda068ab786a57e0d24cb535d41379c471011a6ac757f2ad4802c52249b3280065c4ce31e3a7f932637d8ee37adbccdab3a2bf2f8

Download Submit
memory/1144-2-0x00007FFB31D10000-0x00007FFB31D20000-memory.dmp

Filesize
64KB

Download
memory/1144-3-0x00007FFB31D10000-0x00007FFB31D20000-memory.dmp

Filesize
64KB

Download
memory/1144-4-0x00007FFB31D10000-0x00007FFB31D20000-memory.dmp

Filesize
64KB

Download
memory/1144-5-0x00007FFB55EE0000-0x00007FFB56517000-memory.dmp

Filesize
6.2MB

Download
memory/1144-6-0x00007FFB31D10000-0x00007FFB31D20000-memory.dmp

Filesize
64KB

Download
memory/2404-7-0x0000000000000000-mapping.dmp

Download
memory/2768-11-0x0000000000000000-mapping.dmp

Download
memory/3412-10-0x0000000000000000-mapping.dmp

Download
memory/3804-12-0x0000000000000000-mapping.dmp

Download
memory/4072-8-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads