guloader | ecb4237d66f2000f1cefc832ff1f03a91856f1374646e80855c29eba23abe794

Analysis

max time kernel
144s
max time network
180s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
31-12-2023 13:00

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General

Target

370eb5b97aae87849c88174742049624.exe
Size

60KB
MD5

370eb5b97aae87849c88174742049624
SHA1

c6269ee6a89a9b23edd760f6f3824967886302ca
SHA256

ecb4237d66f2000f1cefc832ff1f03a91856f1374646e80855c29eba23abe794
SHA512

d0d6740acaa82cbcdff072a94cac2d695b5d75123c0ce177cc7e034b7e2cc3f77e5158436fca23034511a15828072be274df689794ae933f47973c76e2c6e8e3
SSDEEP

768:uS8R8zs0uTCaclwUk+W5qXgXT/JdfFRj0Vl/z:uSM0uTXclwUk/51j/Dr2pz

Score

10^/10

guloader downloader guloader persistence

Malware Config

Extracted

Family

guloader

https://drive.google.com/uc?export=download&id=1lw277A8TCTymmoU3xcAVyYliTFln3LiG

xor.base64

Signatures

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

Guloader payload 2 IoCs

guloader

Processes:

resource	yara_rule
behavioral2/memory/4356-2-0x0000000000750000-0x0000000000757000-memory.dmp	family_guloader
behavioral2/memory/1520-4-0x0000000000960000-0x0000000000A60000-memory.dmp	family_guloader

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

RegAsm.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\FORMIDDA = "C:\\Users\\Admin\\Rejseg\\REGENTAL.exe"	RegAsm.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

370eb5b97aae87849c88174742049624.exeRegAsm.exe

pid process

4356 370eb5b97aae87849c88174742049624.exe
1520 RegAsm.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

370eb5b97aae87849c88174742049624.exe

description pid process target process

PID 4356 set thread context of 1520 4356 370eb5b97aae87849c88174742049624.exe RegAsm.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

370eb5b97aae87849c88174742049624.exe

pid process

4356 370eb5b97aae87849c88174742049624.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

370eb5b97aae87849c88174742049624.exe

pid process

4356 370eb5b97aae87849c88174742049624.exe

pid	process
4356	370eb5b97aae87849c88174742049624.exe
1520	RegAsm.exe

description	pid	process	target process
PID 4356 set thread context of 1520	4356	370eb5b97aae87849c88174742049624.exe	RegAsm.exe

pid	process
4356	370eb5b97aae87849c88174742049624.exe

pid	process
4356	370eb5b97aae87849c88174742049624.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

370eb5b97aae87849c88174742049624.exe

description	pid	process	target process
PID 4356 wrote to memory of 1520	4356	370eb5b97aae87849c88174742049624.exe	RegAsm.exe
PID 4356 wrote to memory of 1520	4356	370eb5b97aae87849c88174742049624.exe	RegAsm.exe
PID 4356 wrote to memory of 1520	4356	370eb5b97aae87849c88174742049624.exe	RegAsm.exe
PID 4356 wrote to memory of 1520	4356	370eb5b97aae87849c88174742049624.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\370eb5b97aae87849c88174742049624.exe
"C:\Users\Admin\AppData\Local\Temp\370eb5b97aae87849c88174742049624.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4356

C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\370eb5b97aae87849c88174742049624.exe"
2⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:1520

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

T1102

Impact

Resource Development

Reconnaissance

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Downloads

memory/1520-4-0x0000000000960000-0x0000000000A60000-memory.dmp

Filesize
1024KB

Download
memory/1520-5-0x0000000077A91000-0x0000000077BB1000-memory.dmp

Filesize
1.1MB

Download
memory/4356-2-0x0000000000750000-0x0000000000757000-memory.dmp

Filesize
28KB

Download
memory/4356-3-0x0000000077A91000-0x0000000077BB1000-memory.dmp

Filesize
1.1MB

Download
memory/4356-7-0x0000000000750000-0x0000000000757000-memory.dmp

Filesize
28KB

Download
memory/4356-17-0x0000000000750000-0x0000000000757000-memory.dmp

Filesize
28KB

Download