guloader | 75dee70b0047e52c6f917d72cd604aa2ae7a84ebc93b9884e3c26267d601bb99

General

Target

Shipment Doc_58895592612.exe
Size

64KB
MD5

ca44231475c356476956fe42f9d22f9d
SHA1

2b7ee5dae6182ff36430316bef7810d8bd29d89a
SHA256

710e897de806be68f2888fa89da4479429409cae595a8c7f8c582cc0de722083
SHA512

f6fafddba8ee2194e7206aaf1739bbd4aa72b687676e9df08810e05ed8c11373da494a1a87a3b0b8bb511917232f2926908e48f2a6b337d7cd505333aa8148b3

Score

10^/10

guloader downloader guloader

Malware Config

Extracted

Family

guloader

C2

https://drive.google.com/uc?export=download&id=1NyXP84dulE0oDd6gCNcC5COgBELKShl5

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/1488-58-0x0000000000DCCE5E-mapping.dmp	family_guloader
behavioral1/memory/1488-64-0x0000000000290000-0x0000000000390000-memory.dmp	family_guloader

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

Shipment Doc_58895592612.exeRegAsm.exe

pid process

1172 Shipment Doc_58895592612.exe
1488 RegAsm.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

Shipment Doc_58895592612.exe

description pid process target process

PID 1172 set thread context of 1488 1172 Shipment Doc_58895592612.exe RegAsm.exe
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

Shipment Doc_58895592612.exe

pid process

1172 Shipment Doc_58895592612.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Shipment Doc_58895592612.exe

pid process

1172 Shipment Doc_58895592612.exe

pid	process
1172	Shipment Doc_58895592612.exe
1488	RegAsm.exe

description	pid	process	target process
PID 1172 set thread context of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe

pid	process
1172	Shipment Doc_58895592612.exe

pid	process
1172	Shipment Doc_58895592612.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Shipment Doc_58895592612.exe

description	pid	process	target process
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe
PID 1172 wrote to memory of 1488	1172	Shipment Doc_58895592612.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\Shipment Doc_58895592612.exe
"C:\Users\Admin\AppData\Local\Temp\Shipment Doc_58895592612.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1172

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\Shipment Doc_58895592612.exe"
2⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:1488

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/1172-57-0x0000000076191000-0x0000000076193000-memory.dmp

Filesize
8KB

Download
memory/1172-61-0x00000000002B0000-0x00000000002B9000-memory.dmp

Filesize
36KB

Download
memory/1172-62-0x0000000077350000-0x00000000774F9000-memory.dmp

Filesize
1.7MB

Download
memory/1172-63-0x0000000077530000-0x00000000776B0000-memory.dmp

Filesize
1.5MB

Download
memory/1172-67-0x00000000002B0000-0x00000000002B9000-memory.dmp

Filesize
36KB

Download
memory/1172-68-0x0000000077530000-0x00000000776B0000-memory.dmp

Filesize
1.5MB

Download
memory/1488-58-0x0000000000DCCE5E-mapping.dmp

Download
memory/1488-64-0x0000000000290000-0x0000000000390000-memory.dmp

Filesize
1024KB

Download
memory/1488-65-0x0000000077350000-0x00000000774F9000-memory.dmp

Filesize
1.7MB

Download
memory/1488-66-0x0000000077530000-0x00000000776B0000-memory.dmp

Filesize
1.5MB

Download

Analysis

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