guloader | 3b55d84be662d16da66a6fd5ba49a31fc3de1ce350c43fddb7423c77ee00da96

Analysis

max time kernel
149s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
20/02/2025, 08:13

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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 collection discovery downloader rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

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

Detected Nirsoft tools 7 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/336-45-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/3232-51-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4368-55-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4368-54-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/336-47-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/3232-44-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3232-59-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/336-45-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/336-47-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/3232-51-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/3232-44-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/3232-59-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 1 IoCs

pid	Process
3748	CUSTOMER DATA.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2593460650-190333679-3676257533-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	CUSTOMER DATA.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
4960	CUSTOMER DATA.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
3748	CUSTOMER DATA.exe
4960	CUSTOMER DATA.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4960 set thread context of 3232	4960	CUSTOMER DATA.exe	90
PID 4960 set thread context of 336	4960	CUSTOMER DATA.exe	91
PID 4960 set thread context of 4368	4960	CUSTOMER DATA.exe	92

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 5 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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	CUSTOMER DATA.exe
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: EnumeratesProcesses 6 IoCs

pid	Process
3232	CUSTOMER DATA.exe
3232	CUSTOMER DATA.exe
4368	CUSTOMER DATA.exe
4368	CUSTOMER DATA.exe
3232	CUSTOMER DATA.exe
3232	CUSTOMER DATA.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
3748	CUSTOMER DATA.exe
4960	CUSTOMER DATA.exe
4960	CUSTOMER DATA.exe
4960	CUSTOMER DATA.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4368	CUSTOMER DATA.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4960	CUSTOMER DATA.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 3748 wrote to memory of 4960	3748	CUSTOMER DATA.exe	87
PID 3748 wrote to memory of 4960	3748	CUSTOMER DATA.exe	87
PID 3748 wrote to memory of 4960	3748	CUSTOMER DATA.exe	87
PID 3748 wrote to memory of 4960	3748	CUSTOMER DATA.exe	87
PID 4960 wrote to memory of 3232	4960	CUSTOMER DATA.exe	90
PID 4960 wrote to memory of 3232	4960	CUSTOMER DATA.exe	90
PID 4960 wrote to memory of 3232	4960	CUSTOMER DATA.exe	90
PID 4960 wrote to memory of 336	4960	CUSTOMER DATA.exe	91
PID 4960 wrote to memory of 336	4960	CUSTOMER DATA.exe	91
PID 4960 wrote to memory of 336	4960	CUSTOMER DATA.exe	91
PID 4960 wrote to memory of 4368	4960	CUSTOMER DATA.exe	92
PID 4960 wrote to memory of 4368	4960	CUSTOMER DATA.exe	92
PID 4960 wrote to memory of 4368	4960	CUSTOMER DATA.exe	92

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:3748
- 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
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4960
- - C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe
    "C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe" /stext "C:\Users\Admin\AppData\Local\Temp\mipvqhhg"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:3232
- - C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe
    "C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe" /stext "C:\Users\Admin\AppData\Local\Temp\ocufraribdeu"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:336
- - C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe
    "C:\Users\Admin\AppData\Local\Temp\CUSTOMER DATA.exe" /stext "C:\Users\Admin\AppData\Local\Temp\zfzysscbplwhdrb"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
cc1e4b0b723fa8dddfb80adf881900a4

SHA1
9342699e139e50747f2164fa7f73660808dd5d28

SHA256
d5bf7105ce3fbd56032c5645b43ea3d3e338df521126f08051be67d452ccb6e7

SHA512
2e85b21522a678e2a3efed6c0415e9a7d0829fceb69ad6339fbf0dc510c42ac6e3f6fb18962a59a43e22ed60d86f8fbbf024de60cce226f9ebf122e90a5bde87

Download Submit
C:\Users\Admin\AppData\Local\Temp\mipvqhhg

Filesize
4KB

MD5
a10a7880fd891af53a748b804855901d

SHA1
c94a0f84df3e6c0a74eaafa85c43462bcbf3daf2

SHA256
3e77496a6009fe4dc09f9f876d43ef533893f3e3ab19bd14ed7532af4ac35fb5

SHA512
c71759e33b746eb7cd08663abf20cc707c29943c00a01b627110919f901c6de9fdb3d15c4ece81d5f5c2969593fda1c1f403dca26915f52c3de9d97444627fbf

Download Submit
C:\Users\Admin\AppData\Local\Temp\nssD91C.tmp\System.dll

Filesize
12KB

MD5
cff85c549d536f651d4fb8387f1976f2

SHA1
d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

SHA256
8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

SHA512
531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

Download Submit
memory/336-41-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/336-45-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/336-43-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/336-47-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3232-39-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3232-44-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3232-40-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3232-59-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3232-51-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3748-23-0x0000000077691000-0x00000000777B1000-memory.dmp

Filesize
1.1MB

Download
memory/3748-25-0x00000000744F5000-0x00000000744F6000-memory.dmp

Filesize
4KB

Download
memory/3748-24-0x0000000077691000-0x00000000777B1000-memory.dmp

Filesize
1.1MB

Download
memory/4368-53-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4368-54-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4368-52-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4368-55-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4960-68-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-31-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-26-0x00000000016E0000-0x0000000005673000-memory.dmp

Filesize
63.6MB

Download
memory/4960-27-0x0000000077718000-0x0000000077719000-memory.dmp

Filesize
4KB

Download
memory/4960-29-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-34-0x00000000016E0000-0x0000000005673000-memory.dmp

Filesize
63.6MB

Download
memory/4960-35-0x0000000077691000-0x00000000777B1000-memory.dmp

Filesize
1.1MB

Download
memory/4960-66-0x0000000036790000-0x00000000367A9000-memory.dmp

Filesize
100KB

Download
memory/4960-65-0x0000000036790000-0x00000000367A9000-memory.dmp

Filesize
100KB

Download
memory/4960-62-0x0000000036790000-0x00000000367A9000-memory.dmp

Filesize
100KB

Download
memory/4960-71-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-28-0x0000000077735000-0x0000000077736000-memory.dmp

Filesize
4KB

Download
memory/4960-74-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-77-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-80-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-83-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-86-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-89-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-92-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-95-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download
memory/4960-98-0x0000000000480000-0x00000000016D4000-memory.dmp

Filesize
18.3MB

Download