7da7cffd72c1d4cf8503f8c52fc80dc5695d4418980756118ddc1ade7057d010

General

Target

Complaint-Letter-179737565-03102021.xls
Size

276KB
MD5

cbc490561df4ba515e732409dda1c5e2
SHA1

99de9b0b984f203b35d005351a29a319f397ad3b
SHA256

27d7998ed5c47081aafb88662a805bf9bd79013559ab2c73a911f3cf0954c585
SHA512

2115c4ad7c3c18b38d287aba58b1e848183ffb8b1e4c05a7d2f765fb2ce73ca656c7ebdfff51a3aa420d22f0cac5736703b1a590a81eb9fc0323603c35db92d2

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	500	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2940	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3440	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	196	1456	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3784	1456	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

1456 EXCEL.EXE

Suspicious use of SetWindowsHookEx 19 IoCs

Processes:

EXCEL.EXE

pid	process
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE
1456	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1456 wrote to memory of 500	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 500	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 2940	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 2940	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3440	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3440	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 196	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 196	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3784	1456	EXCEL.EXE	rundll32.exe
PID 1456 wrote to memory of 3784	1456	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-179737565-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1456

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:500

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2940

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3440

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:196

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3784

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/196-10-0x0000000000000000-mapping.dmp

Download
memory/500-7-0x0000000000000000-mapping.dmp

Download
memory/1456-2-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/1456-3-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/1456-4-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/1456-5-0x00007FFB59020000-0x00007FFB59657000-memory.dmp

Filesize
6.2MB

Download
memory/1456-6-0x00007FFB33400000-0x00007FFB33410000-memory.dmp

Filesize
64KB

Download
memory/2940-8-0x0000000000000000-mapping.dmp

Download
memory/3440-9-0x0000000000000000-mapping.dmp

Download
memory/3784-11-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads