guloader | 309ec4a383a2322d4d5bf95da7efed35f43b4957b5f5255003d93019dd10ba70

General

Target

C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe
Size

456KB
MD5

c3bbddb6cebd8672a4fa8b7b8ba20a1e
SHA1

4dae188eb28413a1f8b21e22761cd1d65260a495
SHA256

309ec4a383a2322d4d5bf95da7efed35f43b4957b5f5255003d93019dd10ba70
SHA512

9e6212501f9a4a23dd5f6972ed837c91bb61affcf4ce4fa710f558c9cc1db4618ea10613fc6da4d2f66fd1801e39adc7a9db942a2775b24df412ecedca113e1c
SSDEEP

12288:q2d0rASyHEXQ+ex/NeG7t1utf5P7kYiHG:qoSyUy/YwrG

Score

10^/10

guloader discovery downloader persistence

Malware Config

Signatures

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

C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exeieinstal.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	ieinstal.exe

Loads dropped DLL 1 IoCs

Processes:

C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

pid process

1712 C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

pid	process
1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

ieinstal.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	ieinstal.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Homonuclear = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Julekalenderen149\\Straalingsintensiteter.exe"	ieinstal.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exeieinstal.exe

pid process

1712 C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe
1136 ieinstal.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

description pid process target process

PID 1712 set thread context of 1136 1712 C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe ieinstal.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

pid process

1712 C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

pid	process
1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe
1136	ieinstal.exe

description	pid	process	target process
PID 1712 set thread context of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe

pid	process
1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe

description	pid	process	target process
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe
PID 1712 wrote to memory of 1136	1712	C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe	ieinstal.exe

C:\Users\Admin\AppData\Local\Temp\C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe
"C:\Users\Admin\AppData\Local\Temp\C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1712

C:\Program Files (x86)\internet explorer\ieinstal.exe
"C:\Users\Admin\AppData\Local\Temp\C3BBDDB6CEBD8672A4FA8B7B8BA20A1E.exe"
2⤵
- Checks QEMU agent file
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:1136

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nst7F30.tmp\System.dll
Filesize
11KB

MD5
8b3830b9dbf87f84ddd3b26645fed3a0

SHA1
223bef1f19e644a610a0877d01eadc9e28299509

SHA256
f004c568d305cd95edbd704166fcd2849d395b595dff814bcc2012693527ac37

SHA512
d13cfd98db5ca8dc9c15723eee0e7454975078a776bce26247228be4603a0217e166058ebadc68090afe988862b7514cb8cb84de13b3de35737412a6f0a8ac03

Download Submit
memory/1136-61-0x00000000002E0000-0x00000000003E0000-memory.dmp

Filesize
1024KB

Download
memory/1136-70-0x0000000077AC0000-0x0000000077C40000-memory.dmp

Filesize
1.5MB

Download
memory/1136-67-0x00000000778E0000-0x0000000077A89000-memory.dmp

Filesize
1.7MB

Download
memory/1136-66-0x00000000002E0000-0x00000000003E0000-memory.dmp

Filesize
1024KB

Download
memory/1136-62-0x00000000002E0000-mapping.dmp

Download
memory/1712-57-0x00000000060A0000-0x00000000061A1000-memory.dmp

Filesize
1.0MB

Download
memory/1712-63-0x0000000077AC0000-0x0000000077C40000-memory.dmp

Filesize
1.5MB

Download
memory/1712-64-0x0000000077AC0000-0x0000000077C40000-memory.dmp

Filesize
1.5MB

Download
memory/1712-65-0x0000000077AC0000-0x0000000077C40000-memory.dmp

Filesize
1.5MB

Download
memory/1712-58-0x00000000778E0000-0x0000000077A89000-memory.dmp

Filesize
1.7MB

Download
memory/1712-54-0x00000000762B1000-0x00000000762B3000-memory.dmp

Filesize
8KB

Download
memory/1712-56-0x00000000060A0000-0x00000000061A1000-memory.dmp

Filesize
1.0MB

Download
memory/1712-73-0x00000000060A0000-0x00000000061A1000-memory.dmp

Filesize
1.0MB

Download
memory/1712-74-0x0000000077AC0000-0x0000000077C40000-memory.dmp

Filesize
1.5MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads