guloader | caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4

General

Target

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe
Size

132KB
MD5

dfdbbafef5cf6b3358a099dac867fec6
SHA1

fa970f770679a60d0eea9f7e834414335a547721
SHA256

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4
SHA512

5f248feb2c07bd8041d54d620219ef807cdbaa296d657b73063ec38093588049cc12f190164433a9c3be7278b63e5cb224f2e173117426b52c61a004df362b30
SSDEEP

1536:AZHtnIRYS5/Cac/Lo58OT4o/jbkZGcEXH+zX6JaB4a1L73rGUn2MEz:Ph6g8CRTHSNB4a137GU2X

Score

10^/10

guloader downloader guloader persistence

Malware Config

Extracted

Family

guloader

C2

https://drive.google.com/uc?export=download&id=1-HLxBTGgDQAJoi4W7itkL8n6nA0XOFJK

xor.base64

Signatures

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

Guloader payload 4 IoCs

guloader

Processes:

resource	yara_rule
behavioral2/memory/4980-134-0x0000000002970000-0x000000000297B000-memory.dmp	family_guloader
behavioral2/memory/3528-136-0x0000000000000000-mapping.dmp	family_guloader
behavioral2/memory/3528-139-0x0000000000B80000-0x0000000000C80000-memory.dmp	family_guloader
behavioral2/memory/3528-143-0x0000000000B80000-0x0000000000C80000-memory.dmp	family_guloader

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

Processes:

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exeRegAsm.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	RegAsm.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

RegAsm.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	RegAsm.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Startup key = "C:\\Users\\Admin\\subfolder1\\system.exe"	RegAsm.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exeRegAsm.exe

pid process

4980 caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe
3528 RegAsm.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe

description	pid	process	target process
PID 4980 set thread context of 3528	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe

Suspicious behavior: MapViewOfSection 3 IoCs

Processes:

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe

pid	process
4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe
4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe
4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe

pid process

4980 caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe

description	pid	process	target process
PID 4980 wrote to memory of 4416	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 4416	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 4416	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 2808	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 2808	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 2808	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 3528	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 3528	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 3528	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe
PID 4980 wrote to memory of 3528	4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe
"C:\Users\Admin\AppData\Local\Temp\caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe"
1⤵
- Checks QEMU agent file
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4980

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe"
2⤵
PID:4416

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe"
2⤵
PID:2808

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Users\Admin\AppData\Local\Temp\caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe"
2⤵
- Checks QEMU agent file
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:3528

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1

T1102

Impact

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Downloads

memory/3528-141-0x00000000774A0000-0x0000000077643000-memory.dmp

Filesize
1.6MB

Download
memory/3528-144-0x00000000774A0000-0x0000000077643000-memory.dmp

Filesize
1.6MB

Download
memory/3528-136-0x0000000000000000-mapping.dmp

Download
memory/3528-143-0x0000000000B80000-0x0000000000C80000-memory.dmp

Filesize
1024KB

Download
memory/3528-138-0x00007FFD52130000-0x00007FFD52325000-memory.dmp

Filesize
2.0MB

Download
memory/3528-139-0x0000000000B80000-0x0000000000C80000-memory.dmp

Filesize
1024KB

Download
memory/3528-142-0x00007FFD52130000-0x00007FFD52325000-memory.dmp

Filesize
2.0MB

Download
memory/4980-137-0x00000000774A0000-0x0000000077643000-memory.dmp

Filesize
1.6MB

Download
memory/4980-140-0x0000000002970000-0x000000000297B000-memory.dmp

Filesize
44KB

Download
memory/4980-134-0x0000000002970000-0x000000000297B000-memory.dmp

Filesize
44KB

Download
memory/4980-135-0x00007FFD52130000-0x00007FFD52325000-memory.dmp

Filesize
2.0MB

Download
memory/4980-145-0x0000000002970000-0x000000000297B000-memory.dmp

Filesize
44KB

Download
memory/4980-146-0x00000000774A0000-0x0000000077643000-memory.dmp

Filesize
1.6MB

Download

pid	process
4980	caad589daa525d04613405455e0304f0197ea33a3aa9e8152a99249dac2f42a4.exe
3528	RegAsm.exe

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads