guloader | 9a1ac6e1260499e4eedc63dfc8ee2398d23018c5333a9d282270e68051112372

Analysis

max time kernel
100s
max time network
212s
platform
windows11-21h2_x64
resource
win11-20250610-en
resource tags

arch:x64arch:x86image:win11-20250610-enlocale:en-usos:windows11-21h2-x64system
submitted
02/07/2025, 04:04

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General

Target
Factura sillón María.exe
Size 609KB
Sample250702-em2brasnv2
SHA256 4815643bf9e3c51ae12955f15fe3a7a54fb41b37bc1cdcf41ad6b7b1b52adc95
MD5 913c3d4c9b490ed522b8c5345195d0d6
SHA1 e1c546bf8fca8d8c0c12335668bab4f7bae21067
SHA512 10100a28253ff7d23dbf90626d9ac872cd9bfc2810023f30042e21a712a9cd73b28f640345aa2bc58b09f1169166cc93a59301ef2b4f3aac2dfbfe9ffabd71df
SSDEEP 12288:HUL92GRoUpRgPhLjQZloDSzafxDTOywdtHYRnMi:H8FKCmfQ75aZl6RUb
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Loads dropped DLL 10 IoCs

pid	Process
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe
5772	Factura sillón María.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
5772	Factura sillón María.exe

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\triumfator\Unatrophied242.ini	Factura sillón María.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\principielle.txt	Factura sillón María.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3408	4532	WerFault.exe	78

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Factura sillón María.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Factura sillón María.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
5772	Factura sillón María.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5772 wrote to memory of 4532	5772	Factura sillón María.exe	78
PID 5772 wrote to memory of 4532	5772	Factura sillón María.exe	78
PID 5772 wrote to memory of 4532	5772	Factura sillón María.exe	78
PID 5772 wrote to memory of 4532	5772	Factura sillón María.exe	78
PID 5772 wrote to memory of 4532	5772	Factura sillón María.exe	78

C:\Users\Admin\AppData\Local\Temp\Factura sillón María.exe
"C:\Users\Admin\AppData\Local\Temp\Factura sillón María.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:5772
- C:\Users\Admin\AppData\Local\Temp\Factura sillón María.exe
  "C:\Users\Admin\AppData\Local\Temp\Factura sillón María.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4532
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4532 -s 440
    3⤵
    - Program crash
    PID:3408

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4532 -ip 4532
1⤵
PID:3592

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

LangDLL.dll

Path C:\Users\Admin\AppData\Local\Temp\nsw709E.tmp\LangDLL.dll
Size 5KB
SHA256 5bee24fef5c0f643adc7ee02ccb6e80a72a4eb30d9d326023ac03f0ffbc4e624
MD5 376c1b784a3cca9d10ba4ca5d8cb55d2
SHA1 ad12f8ebab5b4b58eb7d5368469e82e2442b089f
SHA512 6f02f0d878c228de114dee6b0df85152745b43893a252b2e9c309ba943ea56ab1ee678e42d9b0a89162e2bda627d396c2933c02e1c42d0169ac6e05ff3af4bbb
SSDEEP 48:S46+/pTKYKxbWsptIpBtWZ0iV8jAWiAJCvxft2O2B8mzofjLl:zfuPbOBtWZBV8jAWiAJCdv2CmmL
MD5 SHA1 SHA512 SSDEEP

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System.dll

Path C:\Users\Admin\AppData\Local\Temp\nsw709E.tmp\System.dll
Size 11KB
SHA256 f004c568d305cd95edbd704166fcd2849d395b595dff814bcc2012693527ac37
MD5 8b3830b9dbf87f84ddd3b26645fed3a0
SHA1 223bef1f19e644a610a0877d01eadc9e28299509
SHA512 d13cfd98db5ca8dc9c15723eee0e7454975078a776bce26247228be4603a0217e166058ebadc68090afe988862b7514cb8cb84de13b3de35737412a6f0a8ac03
SSDEEP 192:ex24sihno00Wfl97nH6BenXwWobpWBTtvShJ5omi7dJWjOlESlS:h8QIl972eXqlWBFSt273YOlEz
MD5 SHA1 SHA512 SSDEEP

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memory/5772-49-0x0000000004A60000-0x0000000007CBA000-memory.dmp

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memory/5772-50-0x0000000010004000-0x0000000010005000-memory.dmp

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memory/5772-51-0x0000000004A60000-0x0000000007CBA000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads