guloader | 46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b

Analysis

max time kernel
104s
max time network
159s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
25/11/2022, 08:49

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General

Target

46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe
Size

60KB
MD5

daaff39b3854fe5ef5427eec52265fd8
SHA1

4ad3c1cbfc9a19a245195e5044d53a2d26e447f7
SHA256

46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b
SHA512

aa24e27ea4b92dc55abb6f071f03e8f1b99125ee71716d6e66bc969e0d680d5d9d6147946a2a58a72860f4bc8ee630a4ed9c60c676aad610bd00e177c77b8452
SSDEEP

768:xxT8RY10ew25PbGU98RYRlpsZebyk+AnYgQThfnDTdt9z:xiyhGU98CDpsZeb7ng

Score

10^/10

guloader downloader guloader persistence

Malware Config

Extracted

Family

guloader

https://drive.google.com/uc?export=download&id=1x3EIvAyvaXVzTC7xfLdkikFqCA1reHig

xor.base64

Signatures

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

Guloader payload 2 IoCs

guloader

resource	yara_rule
behavioral2/memory/3660-134-0x0000000000000000-mapping.dmp	family_guloader
behavioral2/memory/3660-140-0x0000000001000000-0x0000000001100000-memory.dmp	family_guloader

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	RegAsm.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Egotripper9 = "C:\\Users\\Admin\\Skndig9\\BEGINDB.exe"	RegAsm.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe
3660	RegAsm.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4512 set thread context of 3660	4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe	78

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4512 wrote to memory of 3660	4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe	78
PID 4512 wrote to memory of 3660	4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe	78
PID 4512 wrote to memory of 3660	4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe	78
PID 4512 wrote to memory of 3660	4512	46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe	78

C:\Users\Admin\AppData\Local\Temp\46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe
"C:\Users\Admin\AppData\Local\Temp\46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4512
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\46ca6b60ad6492b4548cb25c5e7ff6981bf7f0a7961743222dc3f25d1f12280b.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:3660

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Web Service

T1102

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3660-138-0x00007FFAD61B0000-0x00007FFAD63A5000-memory.dmp

Filesize
2.0MB

Download
memory/3660-139-0x0000000077380000-0x0000000077523000-memory.dmp

Filesize
1.6MB

Download
memory/3660-140-0x0000000001000000-0x0000000001100000-memory.dmp

Filesize
1024KB

Download
memory/3660-141-0x0000000077380000-0x0000000077523000-memory.dmp

Filesize
1.6MB

Download
memory/3660-142-0x00007FFAD61B0000-0x00007FFAD63A5000-memory.dmp

Filesize
2.0MB

Download
memory/4512-135-0x0000000002AC0000-0x0000000002AC7000-memory.dmp

Filesize
28KB

Download
memory/4512-136-0x00007FFAD61B0000-0x00007FFAD63A5000-memory.dmp

Filesize
2.0MB

Download
memory/4512-137-0x0000000077380000-0x0000000077523000-memory.dmp

Filesize
1.6MB

Download
memory/4512-143-0x0000000002AC0000-0x0000000002AC7000-memory.dmp

Filesize
28KB

Download
memory/4512-144-0x0000000077380000-0x0000000077523000-memory.dmp

Filesize
1.6MB

Download