guloader | aa474883fd952e16e13715aa7a698fa8eb0d596fea71d03dfbaa235a1b08aa15

General

Target
13e0cd9d_by_Libranalysis.exe
Size 109KB
Sample210519-e6rb25gwlx
SHA256 aa474883fd952e16e13715aa7a698fa8eb0d596fea71d03dfbaa235a1b08aa15
MD5 13e0cd9df74775213bc78eba0c269add
SHA1 9a47bf42898712ac86683f9af9df0c6943059f6d
SHA512 45421ff33a5cdc0cb86aea95ba4496b29b2cfb13e6c80548d9cc45bc2e9c1a2e161a99d0deda0defbb95a134305b04c98530ff19fae1e5aea5691e7ee55d17c7
MD5 SHA1 SHA512

Score

10^/10

guloader remcos downloader persistence rat

Malware Config

Extracted

Family

guloader

C2

http://hshjiopklmsacnzbcjuewahfdsnvmlazbcuewqjh.ydns.eu/Eric_2021_eyKIYWgo49.bin

xor.base64

Extracted

Family

remcos

C2

ghdyuienah123.freedynamicdns.org:2006

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Executes dropped EXE 1 IoCs

pid	Process
1560	win.exe

Checks QEMU agent file 2 TTPs 4 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	13e0cd9d_by_Libranalysis.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	13e0cd9d_by_Libranalysis.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	win.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	win.exe

Loads dropped DLL 3 IoCs

pid	Process
1492	cmd.exe
1492	cmd.exe
1664	win.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\	13e0cd9d_by_Libranalysis.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\win = "\"C:\\Users\\Admin\\AppData\\Roaming\\win.exe\""	13e0cd9d_by_Libranalysis.exe
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\	win.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\win = "\"C:\\Users\\Admin\\AppData\\Roaming\\win.exe\""	win.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs

pid	Process
1852	13e0cd9d_by_Libranalysis.exe
1772	13e0cd9d_by_Libranalysis.exe
1772	13e0cd9d_by_Libranalysis.exe
1560	win.exe
1664	win.exe
1664	win.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1852 set thread context of 1772	1852	13e0cd9d_by_Libranalysis.exe	29
PID 1560 set thread context of 1664	1560	win.exe	36

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

pid	Process
1852	13e0cd9d_by_Libranalysis.exe
1560	win.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1852	13e0cd9d_by_Libranalysis.exe
1560	win.exe
1664	win.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 1852 wrote to memory of 1772	1852	13e0cd9d_by_Libranalysis.exe	29
PID 1852 wrote to memory of 1772	1852	13e0cd9d_by_Libranalysis.exe	29
PID 1852 wrote to memory of 1772	1852	13e0cd9d_by_Libranalysis.exe	29
PID 1852 wrote to memory of 1772	1852	13e0cd9d_by_Libranalysis.exe	29
PID 1852 wrote to memory of 1772	1852	13e0cd9d_by_Libranalysis.exe	29
PID 1772 wrote to memory of 1916	1772	13e0cd9d_by_Libranalysis.exe	32
PID 1772 wrote to memory of 1916	1772	13e0cd9d_by_Libranalysis.exe	32
PID 1772 wrote to memory of 1916	1772	13e0cd9d_by_Libranalysis.exe	32
PID 1772 wrote to memory of 1916	1772	13e0cd9d_by_Libranalysis.exe	32
PID 1916 wrote to memory of 1492	1916	WScript.exe	33
PID 1916 wrote to memory of 1492	1916	WScript.exe	33
PID 1916 wrote to memory of 1492	1916	WScript.exe	33
PID 1916 wrote to memory of 1492	1916	WScript.exe	33
PID 1492 wrote to memory of 1560	1492	cmd.exe	35
PID 1492 wrote to memory of 1560	1492	cmd.exe	35
PID 1492 wrote to memory of 1560	1492	cmd.exe	35
PID 1492 wrote to memory of 1560	1492	cmd.exe	35
PID 1560 wrote to memory of 1664	1560	win.exe	36
PID 1560 wrote to memory of 1664	1560	win.exe	36
PID 1560 wrote to memory of 1664	1560	win.exe	36
PID 1560 wrote to memory of 1664	1560	win.exe	36
PID 1560 wrote to memory of 1664	1560	win.exe	36

C:\Users\Admin\AppData\Local\Temp\13e0cd9d_by_Libranalysis.exe
"C:\Users\Admin\AppData\Local\Temp\13e0cd9d_by_Libranalysis.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:1852
- C:\Users\Admin\AppData\Local\Temp\13e0cd9d_by_Libranalysis.exe
  "C:\Users\Admin\AppData\Local\Temp\13e0cd9d_by_Libranalysis.exe"
  2⤵
  - Checks QEMU agent file
  - Adds Run key to start application
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:1772
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1916
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\win.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:1492
    - - C:\Users\Admin\AppData\Roaming\win.exe
        
        C:\Users\Admin\AppData\Roaming\win.exe
        5⤵
        Executes dropped EXE
        Checks QEMU agent file
        Suspicious use of NtSetInformationThreadHideFromDebugger
        Suspicious use of SetThreadContext
        Suspicious behavior: MapViewOfSection
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1560
      - C:\Users\Admin\AppData\Roaming\win.exe
        
        C:\Users\Admin\AppData\Roaming\win.exe
        6⤵
        Checks QEMU agent file
        Loads dropped DLL
        Adds Run key to start application
        Suspicious use of NtSetInformationThreadHideFromDebugger
        Suspicious use of SetWindowsHookEx
        
        PID:1664

Network

MITRE ATT&CK Enterprise 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

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1664-93-0x0000000000400000-0x0000000000421000-memory.dmp

Download

memory/1664-92-0x0000000000401000-0x0000000000541000-memory.dmp

Download

memory/1664-90-0x00000000001B0000-0x00000000002B0000-memory.dmp

Download

memory/1772-68-0x00000000001B0000-0x00000000002B0000-memory.dmp

Download

memory/1772-66-0x0000000000400000-0x0000000000553000-memory.dmp

Download

memory/1772-70-0x0000000000401000-0x0000000000541000-memory.dmp

Download

memory/1772-71-0x0000000000400000-0x0000000000421000-memory.dmp

Download

memory/1852-64-0x0000000076A81000-0x0000000076A83000-memory.dmp

Download

memory/1852-63-0x00000000002F0000-0x00000000002FC000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads