fc8bbe7b84a60771d654fb9efd2cc848e3f3ffe72ce3bb395326d9a15fbd1f59

General

Target

Complaint-Letter-1973823858-03102021.xls
Size

276KB
MD5

8432ec3b0604d96a7ec137b80ac050a2
SHA1

63dfe8269e0451a0a54d91706d85132f50188ea0
SHA256

fc8bbe7b84a60771d654fb9efd2cc848e3f3ffe72ce3bb395326d9a15fbd1f59
SHA512

91f744e0d9e34c0f5adfd88e405f18e180f469e6da457efaea80c841dfaf7f231886c785aa12033c014aba0b418c5fbf74929de1efed73df3a5a72ccedf640b3

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	3904	496	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2308	496	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1420	496	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1824	496	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1912	496	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

496 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE
496	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 496 wrote to memory of 3904	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 3904	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 2308	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 2308	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 1420	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 1420	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 1824	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 1824	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 1912	496	EXCEL.EXE	rundll32.exe
PID 496 wrote to memory of 1912	496	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-1973823858-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:496

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3904

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2308

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1420

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1824

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1912

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\Runtime.brok3
MD5
fc33cd8cee331bca4ce1af6ad1ae7851

SHA1
70815dad906b098a504440c93575b34ce94cd77e

SHA256
e5b9281e4a2de4498353f24e8526367f1c9adbc45dfeb7c13e688a48db07f195

SHA512
456ce363691f65802067c1b67be4668599c82d4b568fb9439cd8537444b20d7af3f684c6ef9faa6e924aa88519ac4b50541f834b56d98077b34b724d40266295

Download Submit
memory/496-2-0x00007FF7E5FB0000-0x00007FF7E5FC0000-memory.dmp

Filesize
64KB

Download
memory/496-3-0x00007FF7E5FB0000-0x00007FF7E5FC0000-memory.dmp

Filesize
64KB

Download
memory/496-4-0x00007FF7E5FB0000-0x00007FF7E5FC0000-memory.dmp

Filesize
64KB

Download
memory/496-5-0x00007FF7E5FB0000-0x00007FF7E5FC0000-memory.dmp

Filesize
64KB

Download
memory/496-6-0x00007FF8091A0000-0x00007FF8097D7000-memory.dmp

Filesize
6.2MB

Download
memory/1420-9-0x0000000000000000-mapping.dmp

Download
memory/1824-10-0x0000000000000000-mapping.dmp

Download
memory/1912-12-0x0000000000000000-mapping.dmp

Download
memory/2308-8-0x0000000000000000-mapping.dmp

Download
memory/3904-7-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads