bcc1731e3f2dc4772be5ad445247f717b82ec84eda5f86adc57824241dc77823

General

Target

Complaint-Letter_1492841762_12042020.xls
Size

43KB
MD5

e1bddad335af1cbf14788dfd3b898a59
SHA1

1bbc9138c1f5fbd83c0484b2e00fc7d0ec03bb4d
SHA256

bcc1731e3f2dc4772be5ad445247f717b82ec84eda5f86adc57824241dc77823
SHA512

7aaf789e6fbdea965773046e966ae57d097c8b07fd5ccdf3ed90a380160c56ea105dfe6da48fb7981b618180f22976e9db0d3f6edd46cec23f83ac0d78526e51

Score

6^/10

Malware Config

Signatures

Process spawned suspicious child process 1 IoCs

This child process is typically not spawned unless (for example) the parent process crashes. This typically indicates the parent process was unsuccessfully compromised.

Processes:

DW20.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	2552	4020	DW20.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

4020 EXCEL.EXE
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

EXCEL.EXEdwwin.exe

pid process

4020 EXCEL.EXE
4020 EXCEL.EXE
200 dwwin.exe
200 dwwin.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

4020 EXCEL.EXE
4020 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE
4020	EXCEL.EXE

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

EXCEL.EXEDW20.EXE

description	pid	process	target process
PID 4020 wrote to memory of 2552	4020	EXCEL.EXE	DW20.EXE
PID 4020 wrote to memory of 2552	4020	EXCEL.EXE	DW20.EXE
PID 2552 wrote to memory of 200	2552	DW20.EXE	dwwin.exe
PID 2552 wrote to memory of 200	2552	DW20.EXE	dwwin.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_1492841762_12042020.xls"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4020
- C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\DW\DW20.EXE
  "C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\DW\DW20.EXE" -x -s 4488
  2⤵
  - Process spawned suspicious child process
  - Suspicious use of WriteProcessMemory
  PID:2552
- - C:\Windows\system32\dwwin.exe
    C:\Windows\system32\dwwin.exe -x -s 4488
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:200

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

memory/200-4-0x0000000000000000-mapping.dmp

Download
memory/200-5-0x000001EDC36E0000-0x000001EDC36E1000-memory.dmp

Filesize
4KB

Download
memory/200-6-0x000001EDC36E0000-0x000001EDC36E1000-memory.dmp

Filesize
4KB

Download
memory/200-8-0x000001EDC3E30000-0x000001EDC3E31000-memory.dmp

Filesize
4KB

Download
memory/200-11-0x000001EDC4230000-0x000001EDC4231000-memory.dmp

Filesize
4KB

Download
memory/200-13-0x000001EDC4230000-0x000001EDC4231000-memory.dmp

Filesize
4KB

Download
memory/200-15-0x000001EDC4080000-0x000001EDC4081000-memory.dmp

Filesize
4KB

Download
memory/200-16-0x000001EDC4080000-0x000001EDC4081000-memory.dmp

Filesize
4KB

Download
memory/200-17-0x000001EDC4080000-0x000001EDC4081000-memory.dmp

Filesize
4KB

Download
memory/2552-3-0x0000000000000000-mapping.dmp

Download
memory/4020-2-0x00007FFE08100000-0x00007FFE08737000-memory.dmp

Filesize
6.2MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads