guloader | 0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15

General

Target

0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe
Size

682KB
MD5

1ee896eb5062be71b5a64050b1475a48
SHA1

fc46f638209638e388fd78e3296f5f1700fc010f
SHA256

0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15
SHA512

c5d2fc305424b5532400df7ff9f424f273f38f2ca91ac145ff239510ced1143c58bc780b0bc28a9d9208c664a4ed6e006041d0d45cd53170fc1661f3719c002f
SSDEEP

12288:wYFMrtB0O4iiEGBXymOKhzqaVuJkw7UGP4ZX9sF+NtgOLISfsAQTw:wYytB0O4i4/OKh2VJN4W8XkcWOLZfsAf

Score

10^/10

guloader remcos remotehost discovery downloader rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

204.10.161.144:2404

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
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-2BC44O
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Guloader family
guloader
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
Remcos family
remcos

Loads dropped DLL 1 IoCs

pid	Process
1592	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
744	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1592	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe
744	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.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	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1592	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
744	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1592 wrote to memory of 744	1592	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe	90
PID 1592 wrote to memory of 744	1592	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe	90
PID 1592 wrote to memory of 744	1592	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe	90
PID 1592 wrote to memory of 744	1592	0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe	90

C:\Users\Admin\AppData\Local\Temp\0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe
"C:\Users\Admin\AppData\Local\Temp\0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1592
- C:\Users\Admin\AppData\Local\Temp\0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe
  "C:\Users\Admin\AppData\Local\Temp\0c401d88ca37c0f3082c17b31112b79a9bbc08224e9566e9daf130ed07f25e15.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:744

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
9f9ffbf3d8936dce4f43931bf965b8d1

SHA1
a399e1c61e60c2237dcf16b09ed3514745cbf767

SHA256
998e9054c21d134f4efae5b04824fea47210c7ef9b07a558d15ac3c629ad2aef

SHA512
667083ba6c6b044f4afcf63d0367f9318e1bff9566d63066a3226c56d5ffdef45b8f7241df49704deb1b25d68c3b136d8623ba018a5e9569f2de4d354c1bbd40

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsfECC3.tmp\System.dll

Filesize
12KB

MD5
cff85c549d536f651d4fb8387f1976f2

SHA1
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

SHA256
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

SHA512
531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

Download Submit
memory/744-34-0x00000000016E0000-0x0000000005673000-memory.dmp

Filesize
63.6MB

Download
memory/744-55-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-26-0x00000000016E0000-0x0000000005673000-memory.dmp

Filesize
63.6MB

Download
memory/744-27-0x00000000775A8000-0x00000000775A9000-memory.dmp

Filesize
4KB

Download
memory/744-28-0x00000000775C5000-0x00000000775C6000-memory.dmp

Filesize
4KB

Download
memory/744-29-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-35-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/744-30-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-67-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-37-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-40-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-64-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-43-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-46-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-49-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-52-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-61-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/744-58-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/1592-24-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/1592-23-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/1592-25-0x0000000074385000-0x0000000074386000-memory.dmp

Filesize
4KB

Download

Analysis

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