guloader | d4ef07a0aa3a3deb3bac17915190bc6901199958a0e15311f1e11ffe544dc950

Analysis

max time kernel
101s
max time network
111s
platform
windows11-21h2_x64
resource
win11-20250502-en
resource tags

arch:x64arch:x86image:win11-20250502-enlocale:en-usos:windows11-21h2-x64system
submitted
02/07/2025, 04:24

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General

Target
Factura.pdf.exe
Size 1.4MB
Sample250702-e1rdpssnz7
SHA256 d4ef07a0aa3a3deb3bac17915190bc6901199958a0e15311f1e11ffe544dc950
MD5 574cc88c85d5baa312edb17127671fd8
SHA1 064909f4659e77fcace665b0728c07ad3e636291
SHA512 b788abe0430196c12c4aef822d7f543a0959f077054f46faecd231ac4fbaf58bf6fe6d9af88671a01cba3dc53cd07cf26f34cf1d1f16cf0f81fae09ca728c4c4
SSDEEP 24576:gXzF/GbE++hYuv0ezm1wvLkS+9cVmvijqAiUzh7QobmmYjAtwC5Yjg9DLz8VxZIo:iJ/GbShYOzSELkSmccv9RHoymRtwjU9K
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 6 IoCs

pid	Process
1252	Factura.pdf.exe
1252	Factura.pdf.exe
1252	Factura.pdf.exe
1252	Factura.pdf.exe
1252	Factura.pdf.exe
1252	Factura.pdf.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
1252	Factura.pdf.exe

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\indhug\unexcessiveness.ini	Factura.pdf.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
4752	4472	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.pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Factura.pdf.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1252	Factura.pdf.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1252 wrote to memory of 4472	1252	Factura.pdf.exe	78
PID 1252 wrote to memory of 4472	1252	Factura.pdf.exe	78
PID 1252 wrote to memory of 4472	1252	Factura.pdf.exe	78
PID 1252 wrote to memory of 4472	1252	Factura.pdf.exe	78
PID 1252 wrote to memory of 4472	1252	Factura.pdf.exe	78

C:\Users\Admin\AppData\Local\Temp\Factura.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Factura.pdf.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1252
- C:\Users\Admin\AppData\Local\Temp\Factura.pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\Factura.pdf.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4472
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 4472 -s 448
    3⤵
    - Program crash
    PID:4752

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4472 -ip 4472
1⤵
PID:3796

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\nse9EC1.tmp\LangDLL.dll
Size 5KB
SHA256 32230128c18574c1e860dfe4b17fe0334f685740e27bc182e0d525a8948c9c2e
MD5 50016010fb0d8db2bc4cd258ceb43be5
SHA1 44ba95ee12e69da72478cf358c93533a9c7a01dc
SHA512 ed4cf49f756fbf673449dca20e63dce6d3a612b61f294efc9c3ccebeffa6a1372667932468816d3a7afdb7e5a652760689d8c6d3f331cedee7247404c879a233
SSDEEP 48:S46+/pTKYKxbWsptIp5tCZ0iVEAWyMEv9v/ft2O2B8m/ofjLl:zbuPbO5tCZBVEAWyMEFv2CmCL
MD5 SHA1 SHA512 SSDEEP

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System.dll

Path C:\Users\Admin\AppData\Local\Temp\nse9EC1.tmp\System.dll
Size 12KB
SHA256 9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706
MD5 4add245d4ba34b04f213409bfe504c07
SHA1 ef756d6581d70e87d58cc4982e3f4d18e0ea5b09
SHA512 1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d
SSDEEP 192:VjHcQ0qWTlt7wi5Aj/lM0sEWD/wtYbBjpNQybC7y+XZv0QPi:B/Qlt7wiij/lMRv/9V4bvr
MD5 SHA1 SHA512 SSDEEP

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memory/1252-45-0x0000000004AB0000-0x0000000005830000-memory.dmp

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memory/1252-46-0x00007FF8387C1000-0x00007FF8388EA000-memory.dmp

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memory/1252-47-0x00007FF8387C0000-0x00007FF8389C9000-memory.dmp

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memory/1252-49-0x0000000004AB0000-0x0000000005830000-memory.dmp

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memory/4472-48-0x00007FF8387C0000-0x00007FF8389C9000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads