3cf601796519e4da293f209c8e9cf32c206b551ca74cc6e612ecbd0a485d36f1

General

Target

Complaint-Letter-1395728961-03102021.xls
Size

276KB
MD5

3ed5528ee05c783b23ac82560ffeff64
SHA1

9433fd1f21b192721e45ecd423b8b9ddc7e82a7b
SHA256

cef5d481de4228ffd8ac4483449c58babd5e389371852faa68ac83748624be36
SHA512

86223d5a921ee5447d12e97dfe984561712177450c4f8ebf711c957ca0d8850afb4ac0ed75bf2c15609a5a54f39c3436395faa92401b393f7e85ef80f9270d87

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	2708	1192	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1684	1192	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2972	1192	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2824	1192	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3924	1192	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\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1192 EXCEL.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

1192 EXCEL.EXE
1192 EXCEL.EXE

Suspicious use of SetWindowsHookEx 14 IoCs

Processes:

EXCEL.EXE

pid	process
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE
1192	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1192 wrote to memory of 2708	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 2708	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 1684	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 1684	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 2972	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 2972	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 2824	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 2824	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 3924	1192	EXCEL.EXE	rundll32.exe
PID 1192 wrote to memory of 3924	1192	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-1395728961-03102021.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:1192

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2708

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1684

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2972

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2824

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3924

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

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

SHA1
40a90b6f98c358bdbdd6e5842c186d919cdde7e3

SHA256
3ad4b3ff863a1ff41ea1e6ebb34f374a8d54804ec27b5531d05e579374bd602b

SHA512
31abced5777e4c5dd3f155fbda068ab786a57e0d24cb535d41379c471011a6ac757f2ad4802c52249b3280065c4ce31e3a7f932637d8ee37adbccdab3a2bf2f8

Download Submit
memory/1192-2-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/1192-3-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/1192-4-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/1192-5-0x00007FFE215B0000-0x00007FFE21BE7000-memory.dmp

Filesize
6.2MB

Download
memory/1192-6-0x00007FFDFD230000-0x00007FFDFD240000-memory.dmp

Filesize
64KB

Download
memory/1684-8-0x0000000000000000-mapping.dmp

Download
memory/2708-7-0x0000000000000000-mapping.dmp

Download
memory/2824-11-0x0000000000000000-mapping.dmp

Download
memory/2972-10-0x0000000000000000-mapping.dmp

Download
memory/3924-12-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads