guloader | 8136f8c683cdfebb012eb0d0130125689beacd54d79937536d20cba9ea7c567d

General

Target

TNT Original Invoice.scr
Size

48KB
MD5

45439e2dfdd3b1f54b4952a46b487fa4
SHA1

d8becaffacaf238a8abe233bff210963d0d36e1e
SHA256

bac78784a96599a619b48b9998c449d213cd113bda215a0b6fe11e358e336785
SHA512

38532b48e6e71907fbd569e4e3ee71322f019368efa1db89f39f9a7b0dd5440859c9b824f6d2f0bda4c7c63ea95547f003c3db3fd571b41ffd75fdf07ea225bf

Score

10^/10

guloader downloader guloader

Malware Config

Extracted

Family

guloader

C2

https://drive.google.com/uc?export=download&id=1gKqCSICYGIrZRanQX1uIQYJBckKa2fUb

xor.base64

Signatures

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

Guloader Payload 2 IoCs

guloader

Processes:

resource	yara_rule
behavioral1/memory/1728-61-0x000000000006B7DE-mapping.dmp	family_guloader
behavioral1/memory/1728-64-0x00000000002B0000-0x00000000003B0000-memory.dmp	family_guloader

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

TNT Original Invoice.scrRegAsm.exe

pid process

848 TNT Original Invoice.scr
1728 RegAsm.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

TNT Original Invoice.scr

description pid process target process

PID 848 set thread context of 1728 848 TNT Original Invoice.scr RegAsm.exe
Suspicious behavior: MapViewOfSection 3 IoCs

Processes:

TNT Original Invoice.scr

pid process

848 TNT Original Invoice.scr
848 TNT Original Invoice.scr
848 TNT Original Invoice.scr
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

TNT Original Invoice.scr

pid process

848 TNT Original Invoice.scr

pid	process
848	TNT Original Invoice.scr
1728	RegAsm.exe

description	pid	process	target process
PID 848 set thread context of 1728	848	TNT Original Invoice.scr	RegAsm.exe

pid	process
848	TNT Original Invoice.scr
848	TNT Original Invoice.scr
848	TNT Original Invoice.scr

pid	process
848	TNT Original Invoice.scr

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

TNT Original Invoice.scr

description	pid	process	target process
PID 848 wrote to memory of 1936	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1936	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1936	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1936	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1936	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1936	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1936	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1456	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1456	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1456	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1456	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1456	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1456	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1456	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe
PID 848 wrote to memory of 1728	848	TNT Original Invoice.scr	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\TNT Original Invoice.scr
"C:\Users\Admin\AppData\Local\Temp\TNT Original Invoice.scr" /S
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:848

C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\TNT Original Invoice.scr" /S
2⤵
PID:1936

C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\TNT Original Invoice.scr" /S
2⤵
PID:1456

C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\TNT Original Invoice.scr" /S
2⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:1728

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1

T1102

Impact

Replay Monitor

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Downloads

memory/848-57-0x0000000075951000-0x0000000075953000-memory.dmp

Filesize
8KB

Download
memory/848-58-0x0000000000290000-0x0000000000298000-memory.dmp

Filesize
32KB

Download
memory/848-59-0x0000000077800000-0x00000000779A9000-memory.dmp

Filesize
1.7MB

Download
memory/848-60-0x00000000779E0000-0x0000000077B60000-memory.dmp

Filesize
1.5MB

Download
memory/848-66-0x0000000000290000-0x0000000000298000-memory.dmp

Filesize
32KB

Download
memory/848-67-0x0000000000290000-0x0000000000298000-memory.dmp

Filesize
32KB

Download
memory/848-68-0x00000000779E0000-0x0000000077B60000-memory.dmp

Filesize
1.5MB

Download
memory/1728-61-0x000000000006B7DE-mapping.dmp

Download
memory/1728-65-0x0000000077800000-0x00000000779A9000-memory.dmp

Filesize
1.7MB

Download
memory/1728-64-0x00000000002B0000-0x00000000003B0000-memory.dmp

Filesize
1024KB

Download

Analysis

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