528843c02e759ea8beec1cfb2046c9ebde01670970db90ef90048237a387e61a

General

Target

Complaint-Letter-1770545757-03102021.xls
Size

276KB
MD5

1b09e1cc905855e5e03f5bfdf28874d2
SHA1

3b5ee62ed39e5d50ff4c41a269b0759d8d7f2088
SHA256

75576374f31710e474434faa2c28d5764f021962106815f06a3e819df48188f6
SHA512

b2d1919de1fa234303f93dcf831d04de995b294e190df64d52e8fa2967ae011eea89d3b32ae20332bfd8dcda0a10db250e357c9fa651eaf66edeffea2d99306f

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	3928	1112	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1468	1112	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	1892	1112	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	3412	1112	rundll32.exe	EXCEL.EXE
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	300	1112	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	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

1112 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

EXCEL.EXE

description	pid	process	target process
PID 1112 wrote to memory of 3928	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 3928	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 1468	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 1468	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 1892	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 1892	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 3412	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 3412	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 300	1112	EXCEL.EXE	rundll32.exe
PID 1112 wrote to memory of 300	1112	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-1770545757-03102021.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1112

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3928

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok1,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1468

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok2,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:1892

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok3,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:3412

C:\Windows\SYSTEM32\rundll32.exe
rundll32 ..\Runtime.brok4,DllRegisterServer
2⤵
- Process spawned unexpected child process
PID:300

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/300-11-0x0000000000000000-mapping.dmp

Download
memory/1112-2-0x00007FFC22770000-0x00007FFC22780000-memory.dmp

Filesize
64KB

Download
memory/1112-3-0x00007FFC22770000-0x00007FFC22780000-memory.dmp

Filesize
64KB

Download
memory/1112-4-0x00007FFC22770000-0x00007FFC22780000-memory.dmp

Filesize
64KB

Download
memory/1112-5-0x00007FFC482C0000-0x00007FFC488F7000-memory.dmp

Filesize
6.2MB

Download
memory/1112-6-0x00007FFC22770000-0x00007FFC22780000-memory.dmp

Filesize
64KB

Download
memory/1468-8-0x0000000000000000-mapping.dmp

Download
memory/1892-9-0x0000000000000000-mapping.dmp

Download
memory/3412-10-0x0000000000000000-mapping.dmp

Download
memory/3928-7-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads