guloader | bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824

General

Target

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
Size

124KB
MD5

1a53e9230ba3bbd5969cc4499baaacdd
SHA1

2a55286c66012cfb09151effabac6f8d54cc3ce1
SHA256

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824
SHA512

3dd984ec282e2bd4ce4e26aa2c84548b69ef695ef761498eb40a4484a9f5be08bca851ca3d868b8b353721b65fd3252a42ebe0ad5cfc70d0591b97b580752f3d

Score

10^/10

guloader downloader persistence

Malware Config

Extracted

Family

guloader

C2

https://drive.google.com/uc?export=download&id=1usXhLD59IUljCZdD222jP2QYU-GP28tz

http://bnvtfhdfsasd.ug/Host_encrypted_F8B4CEF.bin

xor.base64

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Executes dropped EXE 1 IoCs

Processes:

blokstartv.exe

pid process

1384 blokstartv.exe

pid	process
1384	blokstartv.exe

Loads dropped DLL 3 IoCs

Processes:

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exeblokstartv.exe

pid	process
1924	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
1924	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
1836	blokstartv.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exeblokstartv.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\renselsenskry = "C:\\Users\\Admin\\Gasturbineno\\blokstartv.vbs"	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
Key created	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	blokstartv.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\renselsenskry = "C:\\Users\\Admin\\Gasturbineno\\blokstartv.vbs"	blokstartv.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

Processes:

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exebb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exeblokstartv.exeblokstartv.exe

pid	process
1204	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
1924	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
1384	blokstartv.exe
1836	blokstartv.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exeblokstartv.exe

description	pid	process	target process
PID 1204 set thread context of 1924	1204	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
PID 1384 set thread context of 1836	1384	blokstartv.exe	blokstartv.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 2 IoCs

Processes:

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exeblokstartv.exe

pid process

1204 bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
1384 blokstartv.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exeblokstartv.exe

pid process

1204 bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
1384 blokstartv.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exebb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exeblokstartv.exe

description	pid	process	target process
PID 1204 wrote to memory of 1924	1204	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
PID 1204 wrote to memory of 1924	1204	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
PID 1204 wrote to memory of 1924	1204	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
PID 1204 wrote to memory of 1924	1204	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
PID 1204 wrote to memory of 1924	1204	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
PID 1924 wrote to memory of 1384	1924	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	blokstartv.exe
PID 1924 wrote to memory of 1384	1924	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	blokstartv.exe
PID 1924 wrote to memory of 1384	1924	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	blokstartv.exe
PID 1924 wrote to memory of 1384	1924	bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe	blokstartv.exe
PID 1384 wrote to memory of 1836	1384	blokstartv.exe	blokstartv.exe
PID 1384 wrote to memory of 1836	1384	blokstartv.exe	blokstartv.exe
PID 1384 wrote to memory of 1836	1384	blokstartv.exe	blokstartv.exe
PID 1384 wrote to memory of 1836	1384	blokstartv.exe	blokstartv.exe
PID 1384 wrote to memory of 1836	1384	blokstartv.exe	blokstartv.exe

C:\Users\Admin\AppData\Local\Temp\bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
"C:\Users\Admin\AppData\Local\Temp\bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe"
1⤵
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1204

C:\Users\Admin\AppData\Local\Temp\bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe
"C:\Users\Admin\AppData\Local\Temp\bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824.exe"
2⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:1924

C:\Users\Admin\Gasturbineno\blokstartv.exe
"C:\Users\Admin\Gasturbineno\blokstartv.exe"
3⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1384

C:\Users\Admin\Gasturbineno\blokstartv.exe
"C:\Users\Admin\Gasturbineno\blokstartv.exe"
4⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:1836

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

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

1

T1102

Impact

Replay Monitor

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Downloads

C:\Users\Admin\Gasturbineno\blokstartv.exe
MD5
1a53e9230ba3bbd5969cc4499baaacdd

SHA1
2a55286c66012cfb09151effabac6f8d54cc3ce1

SHA256
bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824

SHA512
3dd984ec282e2bd4ce4e26aa2c84548b69ef695ef761498eb40a4484a9f5be08bca851ca3d868b8b353721b65fd3252a42ebe0ad5cfc70d0591b97b580752f3d

Download Submit
C:\Users\Admin\Gasturbineno\blokstartv.exe
MD5
1a53e9230ba3bbd5969cc4499baaacdd

SHA1
2a55286c66012cfb09151effabac6f8d54cc3ce1

SHA256
bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824

SHA512
3dd984ec282e2bd4ce4e26aa2c84548b69ef695ef761498eb40a4484a9f5be08bca851ca3d868b8b353721b65fd3252a42ebe0ad5cfc70d0591b97b580752f3d

Download Submit
C:\Users\Admin\Gasturbineno\blokstartv.exe
MD5
1a53e9230ba3bbd5969cc4499baaacdd

SHA1
2a55286c66012cfb09151effabac6f8d54cc3ce1

SHA256
bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824

SHA512
3dd984ec282e2bd4ce4e26aa2c84548b69ef695ef761498eb40a4484a9f5be08bca851ca3d868b8b353721b65fd3252a42ebe0ad5cfc70d0591b97b580752f3d

Download Submit
\Users\Admin\Gasturbineno\blokstartv.exe
MD5
1a53e9230ba3bbd5969cc4499baaacdd

SHA1
2a55286c66012cfb09151effabac6f8d54cc3ce1

SHA256
bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824

SHA512
3dd984ec282e2bd4ce4e26aa2c84548b69ef695ef761498eb40a4484a9f5be08bca851ca3d868b8b353721b65fd3252a42ebe0ad5cfc70d0591b97b580752f3d

Download Submit
\Users\Admin\Gasturbineno\blokstartv.exe
MD5
1a53e9230ba3bbd5969cc4499baaacdd

SHA1
2a55286c66012cfb09151effabac6f8d54cc3ce1

SHA256
bb9e4697a8a50fd18aafc26dbb19f7d13f51a8d650d67555f509e5f0aff1b824

SHA512
3dd984ec282e2bd4ce4e26aa2c84548b69ef695ef761498eb40a4484a9f5be08bca851ca3d868b8b353721b65fd3252a42ebe0ad5cfc70d0591b97b580752f3d

Download Submit
memory/1204-62-0x0000000077BC0000-0x0000000077D40000-memory.dmp

Filesize
1.5MB

Download
memory/1204-58-0x0000000000270000-0x000000000027A000-memory.dmp

Filesize
40KB

Download
memory/1204-59-0x00000000779E0000-0x0000000077B89000-memory.dmp

Filesize
1.7MB

Download
memory/1204-57-0x0000000075CE1000-0x0000000075CE3000-memory.dmp

Filesize
8KB

Download
memory/1384-76-0x0000000000240000-0x000000000024A000-memory.dmp

Filesize
40KB

Download
memory/1384-81-0x00000000779E0000-0x0000000077B89000-memory.dmp

Filesize
1.7MB

Download
memory/1384-80-0x0000000077BC0000-0x0000000077D40000-memory.dmp

Filesize
1.5MB

Download
memory/1836-85-0x00000000001B0000-0x00000000002B0000-memory.dmp

Filesize
1024KB

Download
memory/1836-86-0x00000000779E0000-0x0000000077B89000-memory.dmp

Filesize
1.7MB

Download
memory/1836-87-0x0000000077BC0000-0x0000000077D40000-memory.dmp

Filesize
1.5MB

Download
memory/1924-66-0x00000000001B0000-0x0000000000380000-memory.dmp

Filesize
1.8MB

Download
memory/1924-60-0x0000000000400000-0x00000000004DF000-memory.dmp

Filesize
892KB

Download
memory/1924-68-0x0000000077BC0000-0x0000000077D40000-memory.dmp

Filesize
1.5MB

Download
memory/1924-67-0x00000000779E0000-0x0000000077B89000-memory.dmp

Filesize
1.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads