guloader | b3cc4e1f09aa77a31e7071f2a505bfe5f13f9ec3cb73997b0d4a5ac36fc710fa

Analysis

max time kernel
92s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
24-12-2024 14:12

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General

Target

Bank Information.exe
Size

60KB
MD5

8f30fe69d5146ed6130120da495a87f2
SHA1

042be30d423150c335bad3556bb4d290b24c97cc
SHA256

dd23cc62b3dcf7ae6a4063b8a64d925f3b796692c624dde7f9b1b3ee5692c7f5
SHA512

48272c92bfee25c7a8db5b89eaccbbf6d78fce6b05362f05beb1e90ce47fd0435746234d9eb0cb87126c978b3d3a44091f2398afdcbce916239f53d27a52525f
SSDEEP

768:VkDKf+cjuzt1CfCmaW5qXgmT/JdfFBKy7psh:Vk2F5amaW51a/DR7Kh

Score

10^/10

guloader discovery downloader guloader

Malware Config

Extracted

Family

guloader

https://drive.google.com/uc?export=download&id=1XjUHIgW5T6HcodhQNf4poqrFbSYVe2Qd

xor.base64

Signatures

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

Guloader payload 2 IoCs

guloader

resource	yara_rule
behavioral30/memory/5116-2-0x0000000000540000-0x0000000000547000-memory.dmp	family_guloader
behavioral30/memory/384-4-0x0000000000D60000-0x0000000000E60000-memory.dmp	family_guloader

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

Web Service

T1102

flow	ioc
7	drive.google.com
8	drive.google.com

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
5116	Bank Information.exe
384	RegAsm.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5116 set thread context of 384	5116	Bank Information.exe	87

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	Bank Information.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe

Suspicious behavior: MapViewOfSection 6 IoCs

pid	Process
5116	Bank Information.exe
5116	Bank Information.exe
5116	Bank Information.exe
5116	Bank Information.exe
5116	Bank Information.exe
5116	Bank Information.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5116	Bank Information.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 5116 wrote to memory of 3936	5116	Bank Information.exe	82
PID 5116 wrote to memory of 3936	5116	Bank Information.exe	82
PID 5116 wrote to memory of 3936	5116	Bank Information.exe	82
PID 5116 wrote to memory of 2556	5116	Bank Information.exe	83
PID 5116 wrote to memory of 2556	5116	Bank Information.exe	83
PID 5116 wrote to memory of 2556	5116	Bank Information.exe	83
PID 5116 wrote to memory of 696	5116	Bank Information.exe	84
PID 5116 wrote to memory of 696	5116	Bank Information.exe	84
PID 5116 wrote to memory of 696	5116	Bank Information.exe	84
PID 5116 wrote to memory of 872	5116	Bank Information.exe	85
PID 5116 wrote to memory of 872	5116	Bank Information.exe	85
PID 5116 wrote to memory of 872	5116	Bank Information.exe	85
PID 5116 wrote to memory of 4600	5116	Bank Information.exe	86
PID 5116 wrote to memory of 4600	5116	Bank Information.exe	86
PID 5116 wrote to memory of 4600	5116	Bank Information.exe	86
PID 5116 wrote to memory of 384	5116	Bank Information.exe	87
PID 5116 wrote to memory of 384	5116	Bank Information.exe	87
PID 5116 wrote to memory of 384	5116	Bank Information.exe	87
PID 5116 wrote to memory of 384	5116	Bank Information.exe	87

C:\Users\Admin\AppData\Local\Temp\Bank Information.exe
"C:\Users\Admin\AppData\Local\Temp\Bank Information.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5116
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\Bank Information.exe"
  2⤵
  PID:3936
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\Bank Information.exe"
  2⤵
  PID:2556
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\Bank Information.exe"
  2⤵
  PID:696
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\Bank Information.exe"
  2⤵
  PID:872
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\Bank Information.exe"
  2⤵
  PID:4600
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\Bank Information.exe"
  2⤵
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:384

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

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

memory/384-4-0x0000000000D60000-0x0000000000E60000-memory.dmp

Filesize
1024KB

Download
memory/5116-2-0x0000000000540000-0x0000000000547000-memory.dmp

Filesize
28KB

Download
memory/5116-3-0x00000000777B1000-0x00000000778D1000-memory.dmp

Filesize
1.1MB

Download
memory/5116-14-0x0000000000540000-0x0000000000547000-memory.dmp

Filesize
28KB

Download
memory/5116-15-0x0000000000540000-0x0000000000547000-memory.dmp

Filesize
28KB

Download