guloader | 3b55d84be662d16da66a6fd5ba49a31fc3de1ce350c43fddb7423c77ee00da96

General

Target

CUSTOMER DATA.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
1604	CUSTOMER DATA.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4508	CUSTOMER DATA.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1604	CUSTOMER DATA.exe
4508	CUSTOMER DATA.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	CUSTOMER DATA.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	CUSTOMER DATA.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1604	CUSTOMER DATA.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4508	CUSTOMER DATA.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1604 wrote to memory of 4508	1604	CUSTOMER DATA.exe	89
PID 1604 wrote to memory of 4508	1604	CUSTOMER DATA.exe	89
PID 1604 wrote to memory of 4508	1604	CUSTOMER DATA.exe	89
PID 1604 wrote to memory of 4508	1604	CUSTOMER DATA.exe	89

C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe
"C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1604
- C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe
  "C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:4508

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

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
63814eb4e386a3336d2087a201f7cdf3

SHA1
f74d42f6cd59bdf9ccc9a07d75138352194118a4

SHA256
a539d30beae37774bd98586d279f777855db02f2b8868dc85dd0784489bf6046

SHA512
454336ded91bb8aa12882aa63124ee92fb87b93a097df8c97399c4cf5386cd1838fd78ae4748fc5dac5433d5cdec3c9fa0a6b06eb32a5d784bec3afa95a46de9

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsp1F2D.tmp\System.dll

Filesize
12KB

MD5
cff85c549d536f651d4fb8387f1976f2

SHA1
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

SHA256
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

SHA512
531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

Download Submit
memory/1604-23-0x0000000077321000-0x0000000077441000-memory.dmp

Filesize
1.1MB

Download
memory/1604-25-0x0000000074185000-0x0000000074186000-memory.dmp

Filesize
4KB

Download
memory/1604-24-0x0000000077321000-0x0000000077441000-memory.dmp

Filesize
1.1MB

Download
memory/4508-27-0x00000000773A8000-0x00000000773A9000-memory.dmp

Filesize
4KB

Download
memory/4508-45-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-29-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-30-0x0000000077321000-0x0000000077441000-memory.dmp

Filesize
1.1MB

Download
memory/4508-37-0x0000000077321000-0x0000000077441000-memory.dmp

Filesize
1.1MB

Download
memory/4508-32-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-36-0x00000000016E0000-0x0000000005673000-memory.dmp

Filesize
63.6MB

Download
memory/4508-38-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-41-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-28-0x00000000773C5000-0x00000000773C6000-memory.dmp

Filesize
4KB

Download
memory/4508-26-0x00000000016E0000-0x0000000005673000-memory.dmp

Filesize
63.6MB

Download
memory/4508-48-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-51-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-54-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-57-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-60-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4508-63-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download

Analysis

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