guloader | 423365fc831493c0300ddcb2260f1b1bee5f18bc63d5687314caf0ddefa5364e

Analysis

max time kernel
94s
max time network
203s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
24/02/2025, 16:26

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Report Analysis Logs

General

Target

Employee Performance Report.exe
Size

603KB
MD5

1da8315a94f0b1d6ea869d4547ad85ea
SHA1

7990c6e02172f81cbd171ac66f5f61fc0e23d696
SHA256

226beb95ef900ee4bd47d0a20f69d8f83cf3f76ebe397b1fa21863e71fd8f29f
SHA512

724914b2b297d4591ca56e6c4f582d4580e06e7bb9d8c213720d3a46d36714cbe43cd25521a87f72049d803b2272fd1749812ac4ecdba439c0adade0764ca65b
SSDEEP

12288:5UVC9GIaG5ez1SjybpA3K6af5C0FwoZNqF9AUiDeDx3E:KVzK5ez10ya3qfLwo2qDeDB

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
3104	Employee Performance Report.exe
3104	Employee Performance Report.exe

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

Web Service

T1102

flow	ioc
21	drive.google.com
22	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2632	Employee Performance Report.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3104	Employee Performance Report.exe
2632	Employee Performance Report.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	Employee Performance Report.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Employee Performance Report.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe
2632	Employee Performance Report.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3104	Employee Performance Report.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3104 wrote to memory of 2632	3104	Employee Performance Report.exe	89
PID 3104 wrote to memory of 2632	3104	Employee Performance Report.exe	89
PID 3104 wrote to memory of 2632	3104	Employee Performance Report.exe	89
PID 3104 wrote to memory of 2632	3104	Employee Performance Report.exe	89

C:\Users\Admin\AppData\Local\Temp\Employee Performance Report.exe
"C:\Users\Admin\AppData\Local\Temp\Employee Performance Report.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3104
- C:\Users\Admin\AppData\Local\Temp\Employee Performance Report.exe
  "C:\Users\Admin\AppData\Local\Temp\Employee Performance Report.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:2632

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

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsj82BE.tmp\System.dll

Filesize
11KB

MD5
2ae993a2ffec0c137eb51c8832691bcb

SHA1
98e0b37b7c14890f8a599f35678af5e9435906e1

SHA256
681382f3134de5c6272a49dd13651c8c201b89c247b471191496e7335702fa59

SHA512
2501371eb09c01746119305ba080f3b8c41e64535ff09cee4f51322530366d0bd5322ea5290a466356598027e6cda8ab360caef62dcaf560d630742e2dd9bcd9

Download Submit
memory/2632-22-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2632-24-0x0000000001660000-0x000000000340A000-memory.dmp

Filesize
29.7MB

Download
memory/2632-37-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2632-39-0x0000000001660000-0x000000000340A000-memory.dmp

Filesize
29.7MB

Download
memory/2632-40-0x0000000077A41000-0x0000000077B61000-memory.dmp

Filesize
1.1MB

Download
memory/3104-18-0x0000000005730000-0x00000000074DA000-memory.dmp

Filesize
29.7MB

Download
memory/3104-19-0x0000000077A41000-0x0000000077B61000-memory.dmp

Filesize
1.1MB

Download
memory/3104-20-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/3104-23-0x0000000005730000-0x00000000074DA000-memory.dmp

Filesize
29.7MB

Download