8294db28f303c0aee034ad4b6570513f3f5b6271509794863f8c6ac2131e5d84

General

Target

Complaint-Letter-894971806-03102021.xls
Size

276KB
MD5

76f89d2530ceef9b477515c3ca7e01d8
SHA1

6e64aba14a07728d7bcd7ac322eb5ca3a1e4fb5a
SHA256

8294db28f303c0aee034ad4b6570513f3f5b6271509794863f8c6ac2131e5d84
SHA512

4eebf28ab019234381383f64dfd59ecab53219836e2272a39e063e7e4f86bcab306aacc4184ce6e804bbaf9bbd08ddb8288990536062b3a013e23a290453e255

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	3988	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	4032	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	688	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3192	576	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	420	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 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

576 EXCEL.EXE

Suspicious use of SetWindowsHookEx 19 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
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 3988	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3988	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 4032	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 4032	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 688	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 688	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3192	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 3192	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 420	576	EXCEL.EXE	rundll32.exe
PID 576 wrote to memory of 420	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-894971806-03102021.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:3988

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:4032

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:688

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3192

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:420

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.brok3
MD5
507c882f74f91b75c1564075376eb794

SHA1
099e7b5c2f14c58793520eccb3c495bfed0ebe67

SHA256
c601e25a289eebd33d754a6fc4e978656f77e2f0d35a3b79afe7f658007839fe

SHA512
4f7c4cc750bbe8d76d9cfe6fb021cadb5a2e0eec3d4072e5f418fcc65380a09e7607e58d8aecc7c154eaccae16c6133f7878e7015eafc8759a9b6ff92abd9cce

Download Submit
memory/420-12-0x0000000000000000-mapping.dmp

Download
memory/576-5-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/576-2-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/576-6-0x00007FFC344B0000-0x00007FFC34AE7000-memory.dmp

Filesize
6.2MB

Download
memory/576-4-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/576-3-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/576-13-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/576-14-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/576-15-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/576-16-0x00007FFC11220000-0x00007FFC11230000-memory.dmp

Filesize
64KB

Download
memory/688-9-0x0000000000000000-mapping.dmp

Download
memory/3192-10-0x0000000000000000-mapping.dmp

Download
memory/3988-7-0x0000000000000000-mapping.dmp

Download
memory/4032-8-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads