guloader | dc249bae299755c425b8b4fdc1220b81dec4ab0521c863e75e7a75deb6d0a57b

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
18-05-2024 06:54

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General

Target

Invoice.exe
Size

68KB
MD5

1579644ce72ad802ba00e84e8eeda25d
SHA1

ede8b5d633c46f6464f40c693f90bcb9cc5e563e
SHA256

943c00e81e428945cac86a29c06aa8d5569d38090ff1e94d273986861b845114
SHA512

984492d560675301e992b5eebeb4275c4f1abcc6d98c035357189382ceb627a55f267bb63efebddbe633e0a4a7386ee815b02309d90197a1c16ae9e08ca02a10
SSDEEP

1536:FuT6IKi/mNbzwlThmt7m/1vMl0Wqp50n3:TI9/mNbUlThI7m/CbqpSn3

Score

10^/10

guloader downloader guloader persistence

Malware Config

Extracted

Family

guloader

http://185.224.128.43/ariiikkkk_encrypted_7EFF1B0.bin

xor.base64

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Guloader payload 1 IoCs
guloader

Processes:

resource yara_rule

behavioral2/memory/1860-4-0x0000000001200000-0x0000000001300000-memory.dmp family_guloader

resource	yara_rule
behavioral2/memory/1860-4-0x0000000001200000-0x0000000001300000-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-1-5-21-3558294865-3673844354-2255444939-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\sub = "C:\\Users\\Admin\\Immutab3\\trakebruttona.exe"	RegAsm.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

Invoice.exeRegAsm.exe

pid process

3620 Invoice.exe
1860 RegAsm.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

Invoice.exe

description pid process target process

PID 3620 set thread context of 1860 3620 Invoice.exe RegAsm.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

Invoice.exe

pid process

3620 Invoice.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Invoice.exe

pid process

3620 Invoice.exe

pid	process
3620	Invoice.exe
1860	RegAsm.exe

description	pid	process	target process
PID 3620 set thread context of 1860	3620	Invoice.exe	RegAsm.exe

pid	process
3620	Invoice.exe

pid	process
3620	Invoice.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

Invoice.exe

description	pid	process	target process
PID 3620 wrote to memory of 1860	3620	Invoice.exe	RegAsm.exe
PID 3620 wrote to memory of 1860	3620	Invoice.exe	RegAsm.exe
PID 3620 wrote to memory of 1860	3620	Invoice.exe	RegAsm.exe
PID 3620 wrote to memory of 1860	3620	Invoice.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\Invoice.exe
"C:\Users\Admin\AppData\Local\Temp\Invoice.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3620

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\Invoice.exe"
2⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:1860

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

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

memory/1860-5-0x0000000077711000-0x0000000077831000-memory.dmp

Filesize
1.1MB

Download
memory/1860-4-0x0000000001200000-0x0000000001300000-memory.dmp

Filesize
1024KB

Download
memory/1860-7-0x0000000001200000-0x0000000001300000-memory.dmp

Filesize
1024KB

Download
memory/3620-2-0x0000000002140000-0x0000000002147000-memory.dmp

Filesize
28KB

Download
memory/3620-3-0x0000000077711000-0x0000000077831000-memory.dmp

Filesize
1.1MB

Download
memory/3620-8-0x0000000002140000-0x0000000002147000-memory.dmp

Filesize
28KB

Download