guloader | 440b445dc2938b09dc1d5b76d46847b2c7f9892cf2c7b9e99c0aa121a44daa08

General

Target

PO320.exe
Size

615KB
MD5

e9fccc1648186d0d9d291b3b481dce31
SHA1

47039fcdd8bb71f4f1bdd6aeeecd2df1cce22adb
SHA256

057ca391a027c4f82e79fcb660fa61c762fab0bc38b14e94bc387b79faaa578f
SHA512

8be8bdaf238981a2817343f4147ef9a9447a02826f2f209940cb5bd5570721b8759350a91c754e9a57661a3b4ffa39fd41c17a7234b5052b9960a2d90dddcee9
SSDEEP

12288:5bt4OfA5VIfIUXR66S1UVvFWOd+qUhQqUWjGKPFA:5buOfAUfIUh654vgshcy

Score

10^/10

guloader remcos sept22 discovery downloader persistence rat

Malware Config

Extracted

Family

remcos

Botnet

SEPT22

C2

66.154.112.195:4500

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-27W2HG
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

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

Loads dropped DLL 1 IoCs

pid	Process
2156	PO320.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Startup key = "C:\\Users\\Admin\\AppData\\Local\\Temp\\subfolder1\\Fiskemelsfabrikkers192.exe"	PO320.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1760	PO320.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2156	PO320.exe
1760	PO320.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2156 set thread context of 1760	2156	PO320.exe	31

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\borers.Ple85	PO320.exe
File opened for modification	C:\Program Files (x86)\automobility.Spa	PO320.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\vivisects\seasons.ini	PO320.exe
File opened for modification	C:\Windows\Fonts\Marines\Hermodactyl202.sup	PO320.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PO320.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PO320.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2156	PO320.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2156 wrote to memory of 1760	2156	PO320.exe	31
PID 2156 wrote to memory of 1760	2156	PO320.exe	31
PID 2156 wrote to memory of 1760	2156	PO320.exe	31
PID 2156 wrote to memory of 1760	2156	PO320.exe	31
PID 2156 wrote to memory of 1760	2156	PO320.exe	31
PID 2156 wrote to memory of 1760	2156	PO320.exe	31

C:\Users\Admin\AppData\Local\Temp\PO320.exe
"C:\Users\Admin\AppData\Local\Temp\PO320.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2156
- C:\Users\Admin\AppData\Local\Temp\PO320.exe
  "C:\Users\Admin\AppData\Local\Temp\PO320.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  PID:1760

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Users\Admin\AppData\Local\Temp\nsj90CC.tmp\System.dll

Filesize
12KB

MD5
cff85c549d536f651d4fb8387f1976f2

SHA1
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

SHA256
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

SHA512
531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

Download Submit
memory/1760-23-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-24-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-13-0x0000000001500000-0x000000000485F000-memory.dmp

Filesize
51.4MB

Download
memory/1760-14-0x0000000077790000-0x0000000077939000-memory.dmp

Filesize
1.7MB

Download
memory/1760-16-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-17-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-30-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-29-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-22-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-25-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-26-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-27-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/1760-28-0x0000000000490000-0x00000000014F2000-memory.dmp

Filesize
16.4MB

Download
memory/2156-11-0x0000000077791000-0x0000000077892000-memory.dmp

Filesize
1.0MB

Download
memory/2156-12-0x0000000077790000-0x0000000077939000-memory.dmp

Filesize
1.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads