guloader | 25c047be782f1c95576aa6c3cdae9fa1a263fc63fe12851a13013dd7ce067286

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
27/03/2025, 15:17

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General

Target

leping-pdf.exe
Size

810KB
MD5

4dbd532f919ce1dbf60457cca8305137
SHA1

7daa026d598d7c916006e81701db3f791dc2188b
SHA256

b93de10f4d570997495e31de612f6ff52303dd0c488708b933ae02c2bdd8e274
SHA512

89a073fe4363ad01684bd80d800faf54d04d8b2e1f1c2e26546300be248aff6f3156f7bea7053f5947113fe288ae70e86aa6ca346b5fbd4c3b8eca866a956054
SSDEEP

24576:mdYN58vv/f+yQMUJ6Ailn6b/HlSgxgam9uSaviZtXv:mc5IvnfQN6yldjNtvw

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 1 IoCs

pid	Process
2360	leping-pdf.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2360	leping-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
2824	2736	WerFault.exe	31

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	leping-pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	leping-pdf.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2736	leping-pdf.exe
2360	leping-pdf.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2360	leping-pdf.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2360 wrote to memory of 2736	2360	leping-pdf.exe	31
PID 2360 wrote to memory of 2736	2360	leping-pdf.exe	31
PID 2360 wrote to memory of 2736	2360	leping-pdf.exe	31
PID 2360 wrote to memory of 2736	2360	leping-pdf.exe	31
PID 2360 wrote to memory of 2736	2360	leping-pdf.exe	31
PID 2736 wrote to memory of 2824	2736	leping-pdf.exe	32
PID 2736 wrote to memory of 2824	2736	leping-pdf.exe	32
PID 2736 wrote to memory of 2824	2736	leping-pdf.exe	32
PID 2736 wrote to memory of 2824	2736	leping-pdf.exe	32

C:\Users\Admin\AppData\Local\Temp\leping-pdf.exe
"C:\Users\Admin\AppData\Local\Temp\leping-pdf.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2360
- C:\Users\Admin\AppData\Local\Temp\leping-pdf.exe
  "C:\Users\Admin\AppData\Local\Temp\leping-pdf.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2736
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2736 -s 104
    3⤵
    - Program crash
    PID:2824

Network

MITRE ATT&CK Enterprise v15

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

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nse1FE2.tmp\System.dll

Filesize
11KB

MD5
9625d5b1754bc4ff29281d415d27a0fd

SHA1
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0

SHA256
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448

SHA512
dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b

Download Submit
memory/2360-26-0x0000000004400000-0x0000000004F07000-memory.dmp

Filesize
11.0MB

Download
memory/2360-27-0x0000000077A41000-0x0000000077B42000-memory.dmp

Filesize
1.0MB

Download
memory/2360-28-0x0000000077A40000-0x0000000077BE9000-memory.dmp

Filesize
1.7MB

Download
memory/2736-29-0x0000000001470000-0x0000000001F77000-memory.dmp

Filesize
11.0MB

Download
memory/2736-30-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2736-32-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download