guloader | 38473a7da74c7513b8b26550778e6c10337bfa0c8037a5ec1040200c324dcc5b

Resubmissions

20-07-2021 11:03

210720-nzqxzersjs 10

20-07-2021 10:57

210720-n32mpq7vnn 10

Analysis

max time kernel
297s
max time network
276s
platform
windows10_x64
resource
win10v20210410
submitted
20-07-2021 11:03

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General

Target

Despacho_de_informacion.doc
Size

178KB
MD5

d51027ccc08c7a7bf42e481e85196136
SHA1

02abd7025f5e3a721676714410c66fc5b8d95f22
SHA256

38473a7da74c7513b8b26550778e6c10337bfa0c8037a5ec1040200c324dcc5b
SHA512

008279cd4e860de0279b66eac71e2b9da31418e566d2e8f6be4e59cfdb7f192614aaeb838d1a3fea151804ec0f2fac6b093127fe1c8cdfc86c9caacfa69f0fc4

Score

10^/10

guloader downloader

Malware Config

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Executes dropped EXE 1 IoCs

Processes:

PQMYHDUMN.exe

pid process

1264 PQMYHDUMN.exe

pid	process
1264	PQMYHDUMN.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:

WINWORD.EXE

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WINWORD.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

WINWORD.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 2 IoCs

Processes:

WINWORD.EXE

pid process

3164 WINWORD.EXE
3164 WINWORD.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

WINWORD.EXE

pid process

3164 WINWORD.EXE
3164 WINWORD.EXE
Suspicious use of SetWindowsHookEx 8 IoCs

Processes:

WINWORD.EXEPQMYHDUMN.exe

pid process

3164 WINWORD.EXE
3164 WINWORD.EXE
3164 WINWORD.EXE
3164 WINWORD.EXE
3164 WINWORD.EXE
3164 WINWORD.EXE
3164 WINWORD.EXE
1264 PQMYHDUMN.exe

pid	process
3164	WINWORD.EXE
3164	WINWORD.EXE

pid	process
3164	WINWORD.EXE
3164	WINWORD.EXE

pid	process
3164	WINWORD.EXE
3164	WINWORD.EXE
3164	WINWORD.EXE
3164	WINWORD.EXE
3164	WINWORD.EXE
3164	WINWORD.EXE
3164	WINWORD.EXE
1264	PQMYHDUMN.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

WINWORD.EXE

description	pid	process	target process
PID 3164 wrote to memory of 1264	3164	WINWORD.EXE	PQMYHDUMN.exe
PID 3164 wrote to memory of 1264	3164	WINWORD.EXE	PQMYHDUMN.exe
PID 3164 wrote to memory of 1264	3164	WINWORD.EXE	PQMYHDUMN.exe

C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
"C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\Despacho_de_informacion.doc" /o ""
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3164

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\PQMYHDUMN.exe
"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\PQMYHDUMN.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
PID:1264

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\PQMYHDUMN.exe
MD5
1d0e9d6e32cc4fb843df30b40fb3b0b9

SHA1
ac2344b40eef61eb1bfc845b3aa521f6c1f61d4c

SHA256
762b2ef80d674e85ebbd092a060a3dc787195af38bb85c4ac4774fcf320fd665

SHA512
bb09b63307356414347593063b646f0fa2e6cf37907964051eae95e96b781885c5abc374d2913ef03c472186ba7e0d2f7914fc27e9c04767efff91406c2ef94b

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\PQMYHDUMN.exe
MD5
1d0e9d6e32cc4fb843df30b40fb3b0b9

SHA1
ac2344b40eef61eb1bfc845b3aa521f6c1f61d4c

SHA256
762b2ef80d674e85ebbd092a060a3dc787195af38bb85c4ac4774fcf320fd665

SHA512
bb09b63307356414347593063b646f0fa2e6cf37907964051eae95e96b781885c5abc374d2913ef03c472186ba7e0d2f7914fc27e9c04767efff91406c2ef94b

Download Submit
memory/1264-267-0x0000000000000000-mapping.dmp

Download
memory/1264-273-0x00000000021C0000-0x00000000021E9000-memory.dmp

Filesize
164KB

Download
memory/3164-114-0x00007FFD35790000-0x00007FFD357A0000-memory.dmp

Filesize
64KB

Download
memory/3164-115-0x00007FFD35790000-0x00007FFD357A0000-memory.dmp

Filesize
64KB

Download
memory/3164-116-0x00007FFD35790000-0x00007FFD357A0000-memory.dmp

Filesize
64KB

Download
memory/3164-117-0x00007FFD35790000-0x00007FFD357A0000-memory.dmp

Filesize
64KB

Download
memory/3164-119-0x00007FFD35790000-0x00007FFD357A0000-memory.dmp

Filesize
64KB

Download
memory/3164-118-0x00007FFD575D0000-0x00007FFD5A0F3000-memory.dmp

Filesize
43.1MB

Download
memory/3164-122-0x00007FFD50240000-0x00007FFD5132E000-memory.dmp

Filesize
16.9MB

Download
memory/3164-123-0x00007FFD4E340000-0x00007FFD50235000-memory.dmp

Filesize
31.0MB

Download