guloader | 75591cb23ef20e0a1bc8d01a392621d608b83ee25bcf37b330d3e966d2c8a50b

Analysis

max time kernel
132s
max time network
137s
platform
windows10_x64
resource
win10-en
submitted
01/09/2021, 18:36

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General

Target
36909bb88f91e69d271e206ab3fa8f00.exe
Size 444KB
Sample210901-wdtwf15x4e
SHA256 75591cb23ef20e0a1bc8d01a392621d608b83ee25bcf37b330d3e966d2c8a50b
MD5 36909bb88f91e69d271e206ab3fa8f00
SHA1 ca4d3fb640f12537fabe1eb107ef718b21c92c63
SHA512 8b987daa1802e7cd869fa751fae966e8e533e7a7d1edf98949f586140cd26bbfe9efb8521c31938f34ce9ce1d727fbd97880e31f7c44c8f1ac8ae9824ba713a1
MD5 SHA1 SHA512

Score

10^/10

guloader remcos host downloader persistence rat suricata

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

xp19.ddns.net:1996

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
win.exe
copy_folder
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
remcos_awasibpwth
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
vlc
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title

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
suricata: ET MALWARE Generic .bin download from Dotted Quad
suricata: ET MALWARE Generic .bin download from Dotted Quad
suricata
suricata: ET MALWARE Remcos RAT Checkin 23
suricata: ET MALWARE Remcos RAT Checkin 23
suricata

Executes dropped EXE 1 IoCs

pid	Process
1592	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	36909bb88f91e69d271e206ab3fa8f00.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	36909bb88f91e69d271e206ab3fa8f00.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 1 IoCs

pid	Process
3832	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-1-5-21-2559286294-2439613352-4032193287-1000\Software\Microsoft\Windows\CurrentVersion\Run\	36909bb88f91e69d271e206ab3fa8f00.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2559286294-2439613352-4032193287-1000\Software\Microsoft\Windows\CurrentVersion\Run\vlc = "\"C:\\Users\\Admin\\AppData\\Roaming\\win.exe\""	36909bb88f91e69d271e206ab3fa8f00.exe
Key created	\REGISTRY\USER\S-1-5-21-2559286294-2439613352-4032193287-1000\Software\Microsoft\Windows\CurrentVersion\Run\	win.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2559286294-2439613352-4032193287-1000\Software\Microsoft\Windows\CurrentVersion\Run\vlc = "\"C:\\Users\\Admin\\AppData\\Roaming\\win.exe\""	win.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs

pid	Process
3980	36909bb88f91e69d271e206ab3fa8f00.exe
2544	36909bb88f91e69d271e206ab3fa8f00.exe
2544	36909bb88f91e69d271e206ab3fa8f00.exe
1592	win.exe
3832	win.exe
3832	win.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3980 set thread context of 2544	3980	36909bb88f91e69d271e206ab3fa8f00.exe	76
PID 1592 set thread context of 3832	1592	win.exe	81

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2324	PING.EXE

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
3980	36909bb88f91e69d271e206ab3fa8f00.exe
1592	win.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
3980	36909bb88f91e69d271e206ab3fa8f00.exe
1592	win.exe
3832	win.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 3980 wrote to memory of 2544	3980	36909bb88f91e69d271e206ab3fa8f00.exe	76
PID 3980 wrote to memory of 2544	3980	36909bb88f91e69d271e206ab3fa8f00.exe	76
PID 3980 wrote to memory of 2544	3980	36909bb88f91e69d271e206ab3fa8f00.exe	76
PID 3980 wrote to memory of 2544	3980	36909bb88f91e69d271e206ab3fa8f00.exe	76
PID 2544 wrote to memory of 3684	2544	36909bb88f91e69d271e206ab3fa8f00.exe	77
PID 2544 wrote to memory of 3684	2544	36909bb88f91e69d271e206ab3fa8f00.exe	77
PID 2544 wrote to memory of 3684	2544	36909bb88f91e69d271e206ab3fa8f00.exe	77
PID 1592 wrote to memory of 3832	1592	win.exe	81
PID 1592 wrote to memory of 3832	1592	win.exe	81
PID 1592 wrote to memory of 3832	1592	win.exe	81
PID 1592 wrote to memory of 3832	1592	win.exe	81

C:\Users\Admin\AppData\Local\Temp\36909bb88f91e69d271e206ab3fa8f00.exe
"C:\Users\Admin\AppData\Local\Temp\36909bb88f91e69d271e206ab3fa8f00.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:3980
- C:\Users\Admin\AppData\Local\Temp\36909bb88f91e69d271e206ab3fa8f00.exe
  "C:\Users\Admin\AppData\Local\Temp\36909bb88f91e69d271e206ab3fa8f00.exe"
  2⤵
  - Checks QEMU agent file
  - Adds Run key to start application
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of WriteProcessMemory
  PID:2544
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
    3⤵
    PID:3684
  - - C:\Windows\SysWOW64\PING.EXE
      PING 127.0.0.1 -n 2
      4⤵
      Runs ping.exe
      PID:2324
  - - C:\Users\Admin\AppData\Roaming\win.exe
      "C:\Users\Admin\AppData\Roaming\win.exe"
      4⤵
      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:1592
    - - C:\Users\Admin\AppData\Roaming\win.exe
        
        "C:\Users\Admin\AppData\Roaming\win.exe"
        5⤵
        Checks QEMU agent file
        Loads dropped DLL
        Adds Run key to start application
        Suspicious use of NtSetInformationThreadHideFromDebugger
        Suspicious use of SetWindowsHookEx
        
        PID:3832

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1592-138-0x00007FF87E150000-0x00007FF87E32B000-memory.dmp

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memory/1592-139-0x0000000077590000-0x000000007771E000-memory.dmp

Download

memory/1592-140-0x0000000077590000-0x000000007771E000-memory.dmp

Download

memory/2544-120-0x0000000000401000-0x00000000004FD000-memory.dmp

Download

memory/2544-124-0x0000000000560000-0x0000000000660000-memory.dmp

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memory/2544-126-0x0000000077590000-0x000000007771E000-memory.dmp

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memory/2544-125-0x00007FF87E150000-0x00007FF87E32B000-memory.dmp

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memory/2544-127-0x0000000000401000-0x0000000000541000-memory.dmp

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memory/2544-128-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/2544-119-0x0000000000400000-0x0000000000553000-memory.dmp

Download

memory/3832-141-0x0000000000560000-0x0000000000660000-memory.dmp

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memory/3832-142-0x00007FF87E150000-0x00007FF87E32B000-memory.dmp

Download

memory/3832-143-0x0000000077590000-0x000000007771E000-memory.dmp

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memory/3980-117-0x00000000021B0000-0x00000000021C2000-memory.dmp

Download

memory/3980-123-0x0000000077590000-0x000000007771E000-memory.dmp

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memory/3980-122-0x0000000077590000-0x000000007771E000-memory.dmp

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memory/3980-121-0x00007FF87E150000-0x00007FF87E32B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads