88f72155fbaa095cc2ceee5c46e1b3442ba5d476784fa0a3d9484dc0cbcc2ff2

General

Target

Complaint-Letter-699160903-03102021.xls
Size

281KB
MD5

7c29aaed776bb470e5a2f0569ea44d12
SHA1

1e33673add979088a223dd337cea0c974e4dc296
SHA256

85f8f00fc5d2e2de62c0c37cec012e0c8516ec1a83d82056e89fcb38b51bb963
SHA512

a9b852c5a859640121c7b34286879085f15c9dbb0b1fe9705f6f6dc380f46c4a9ebabea79a9b6ae7a943a2a05228881794ffa2e8f25da6e77ff0d54fd55db8c4

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	2036	648	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2636	648	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3808	648	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3968	648	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	948	648	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

648 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE
648	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 648 wrote to memory of 2036	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 2036	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 2636	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 2636	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 3808	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 3808	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 3968	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 3968	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 948	648	EXCEL.EXE	rundll32.exe
PID 648 wrote to memory of 948	648	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-699160903-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:648

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2036

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:2636

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3808

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3968

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:948

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/648-2-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/648-3-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/648-4-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/648-5-0x00007FF851B10000-0x00007FF852147000-memory.dmp

Filesize
6.2MB

Download
memory/648-6-0x00007FF82D760000-0x00007FF82D770000-memory.dmp

Filesize
64KB

Download
memory/948-11-0x0000000000000000-mapping.dmp

Download
memory/2036-7-0x0000000000000000-mapping.dmp

Download
memory/2636-8-0x0000000000000000-mapping.dmp

Download
memory/3808-9-0x0000000000000000-mapping.dmp

Download
memory/3968-10-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads