guloader | fb84f716815f754bb0d14c94098da7d16ac3ff6caae85d110f0f96c8fb83fe24

Analysis

max time kernel
142s
max time network
146s
platform
windows11-21h2_x64
resource
win11-20250410-en
resource tags

arch:x64arch:x86image:win11-20250410-enlocale:en-usos:windows11-21h2-x64system
submitted
17/04/2025, 09:47

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General

Target

doc1172432.exe
Size

722KB
MD5

a27844538feaff20e4fbe39992338bbe
SHA1

d769586f66753fc8507150e0acec662920d0d7b0
SHA256

fb84f716815f754bb0d14c94098da7d16ac3ff6caae85d110f0f96c8fb83fe24
SHA512

65c1563c62fb8b508dbe722690435e600e4ad97f0beff06876e852953b5d8961cf47afaf8f285fd154a0175fbd14de035e59011d2f3e31823fd3c20ab92f092a
SSDEEP

12288:yY/5cwRCTU62skVx5eIqBfwYiGUxiWovro7XrXxqCzh+iKwvQNNux+/XH7P4A3D:yY/5XfgYx5wKGSiW+QrXMCHx+PT4Az

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 2 IoCs

pid	Process
2216	doc1172432.exe
2216	doc1172432.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
1	drive.google.com
2	drive.google.com

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Objectee.ini	doc1172432.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2216	doc1172432.exe
4748	doc1172432.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\otto\asynchronisms.bin	doc1172432.exe

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

System Information Discovery
T1082

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	doc1172432.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	doc1172432.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2216	doc1172432.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2216 wrote to memory of 4748	2216	doc1172432.exe	79
PID 2216 wrote to memory of 4748	2216	doc1172432.exe	79
PID 2216 wrote to memory of 4748	2216	doc1172432.exe	79
PID 2216 wrote to memory of 4748	2216	doc1172432.exe	79

C:\Users\Admin\AppData\Local\Temp\doc1172432.exe
"C:\Users\Admin\AppData\Local\Temp\doc1172432.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2216
- C:\Users\Admin\AppData\Local\Temp\doc1172432.exe
  "C:\Users\Admin\AppData\Local\Temp\doc1172432.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:4748

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

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsrA3E3.tmp\System.dll

Filesize
12KB

MD5
cff85c549d536f651d4fb8387f1976f2

SHA1
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

SHA256
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

SHA512
531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

Download Submit
memory/2216-17-0x00000000032F0000-0x0000000005FFB000-memory.dmp

Filesize
45.0MB

Download
memory/2216-19-0x00007FF83F561000-0x00007FF83F68A000-memory.dmp

Filesize
1.2MB

Download
memory/2216-18-0x00000000032F0000-0x0000000005FFB000-memory.dmp

Filesize
45.0MB

Download
memory/2216-20-0x00007FF83F560000-0x00007FF83F769000-memory.dmp

Filesize
2.0MB

Download
memory/2216-23-0x00000000032F0000-0x0000000005FFB000-memory.dmp

Filesize
45.0MB

Download
memory/4748-22-0x00007FF83F560000-0x00007FF83F769000-memory.dmp

Filesize
2.0MB

Download
memory/4748-33-0x00007FF83F560000-0x00007FF83F769000-memory.dmp

Filesize
2.0MB

Download
memory/4748-32-0x0000000000460000-0x0000000001777000-memory.dmp

Filesize
19.1MB

Download