guloader | 2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68

Analysis

max time kernel
148s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
19/09/2024, 12:28

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General

Target

KZ710-0038.exe
Size

519KB
MD5

cfd30b0bf833178f0d730ae3703b4c56
SHA1

de278f275878b570ce2a5efb69456555e888eaae
SHA256

2181299d4ea8b342a975ace1aed20c49c9ec86d46af6575f31ac1cfcbc240d68
SHA512

109deb972cf14b889687ffd58587a603fd9bd4b2a744bc4fb033552e8148a7232e8021db973432335a9ea1dcc2518effee11eb57ad85c3b34d2239fcc50461b9
SSDEEP

6144:sp8oOpVQtWBonIuwtkzixAn9EF99+wykDaxfnasuDjvdjplyTztn1xT4p+/l/JbX:po+VIWBonIuwQn9EF99+SDRfnqBr+KsW

Score

10^/10

guloader remcos remotehost collection credential_access discovery downloader rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

162.251.122.106:2404

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-A7EXAF
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,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Detected Nirsoft tools 8 IoCs

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

resource	yara_rule
behavioral1/memory/2580-32-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2580-37-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2580-34-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2636-33-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/1700-28-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/2636-38-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/1700-43-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/2636-53-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2636-33-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral1/memory/2636-38-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral1/memory/2636-53-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/1700-28-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/1700-43-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 1 IoCs

pid	Process
2972	KZ710-0038.exe

Reads user/profile data of web browsers 2 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

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	KZ710-0038.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
1804	KZ710-0038.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2972	KZ710-0038.exe
1804	KZ710-0038.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2972 set thread context of 1804	2972	KZ710-0038.exe	31
PID 1804 set thread context of 1700	1804	KZ710-0038.exe	33
PID 1804 set thread context of 2636	1804	KZ710-0038.exe	34
PID 1804 set thread context of 2580	1804	KZ710-0038.exe	35

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	KZ710-0038.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	KZ710-0038.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	KZ710-0038.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	KZ710-0038.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	KZ710-0038.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1700	KZ710-0038.exe
1700	KZ710-0038.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
2972	KZ710-0038.exe
1804	KZ710-0038.exe
1804	KZ710-0038.exe
1804	KZ710-0038.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2580	KZ710-0038.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1804	KZ710-0038.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2972 wrote to memory of 1804	2972	KZ710-0038.exe	31
PID 2972 wrote to memory of 1804	2972	KZ710-0038.exe	31
PID 2972 wrote to memory of 1804	2972	KZ710-0038.exe	31
PID 2972 wrote to memory of 1804	2972	KZ710-0038.exe	31
PID 2972 wrote to memory of 1804	2972	KZ710-0038.exe	31
PID 2972 wrote to memory of 1804	2972	KZ710-0038.exe	31
PID 1804 wrote to memory of 1700	1804	KZ710-0038.exe	33
PID 1804 wrote to memory of 1700	1804	KZ710-0038.exe	33
PID 1804 wrote to memory of 1700	1804	KZ710-0038.exe	33
PID 1804 wrote to memory of 1700	1804	KZ710-0038.exe	33
PID 1804 wrote to memory of 2636	1804	KZ710-0038.exe	34
PID 1804 wrote to memory of 2636	1804	KZ710-0038.exe	34
PID 1804 wrote to memory of 2636	1804	KZ710-0038.exe	34
PID 1804 wrote to memory of 2636	1804	KZ710-0038.exe	34
PID 1804 wrote to memory of 2580	1804	KZ710-0038.exe	35
PID 1804 wrote to memory of 2580	1804	KZ710-0038.exe	35
PID 1804 wrote to memory of 2580	1804	KZ710-0038.exe	35
PID 1804 wrote to memory of 2580	1804	KZ710-0038.exe	35

C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe
"C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2972
- C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe
  "C:\Users\Admin\AppData\Local\Temp\KZ710-0038.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:1804
- - C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe
    C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe /stext "C:\Users\Admin\AppData\Local\Temp\qhcxnqujwdjhhoceu"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:1700
- - C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe
    C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe /stext "C:\Users\Admin\AppData\Local\Temp\bjiqojfdklburcqimljw"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:2636
- - C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe
    C:\Users\Admin\AppData\Local\Temp\KZ710-0038.exe /stext "C:\Users\Admin\AppData\Local\Temp\ldniotqfyttzujmmvvvpcqo"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2580

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
ae8f9afb9ada6c2a352995e291ff02ac

SHA1
e7667142bf3b8b340f8a12c7e2fd1521e7e4f7a1

SHA256
bbb224e1d904d6264464ea0cc2261dd3c72a65359bce5f75baf364aa1b291ee3

SHA512
392422f57410e11fe4883430e15f2ea55b2291d0da01b14042c390e68a1404dff41a8004fcf9198866c4e9adea6d6acad705be76bf346354a7e55002a0225a3e

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

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
\Users\Admin\AppData\Local\Temp\nsyAAC1.tmp\System.dll

Filesize
11KB

MD5
3f176d1ee13b0d7d6bd92e1c7a0b9bae

SHA1
fe582246792774c2c9dd15639ffa0aca90d6fd0b

SHA256
fa4ab1d6f79fd677433a31ada7806373a789d34328da46ccb0449bbf347bd73e

SHA512
0a69124819b7568d0dea4e9e85ce8fe61c7ba697c934e3a95e2dcfb9f252b1d9da7faf8774b6e8efd614885507acc94987733eba09a2f5e7098b774dfc8524b6

Download Submit
memory/1700-43-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1700-24-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1700-26-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1700-28-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1804-18-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-16-0x00000000779A0000-0x0000000077B49000-memory.dmp

Filesize
1.7MB

Download
memory/1804-87-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-60-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-57-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-63-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-72-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-69-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-47-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-51-0x00000000336F0000-0x0000000033709000-memory.dmp

Filesize
100KB

Download
memory/1804-17-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-75-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-78-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-66-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-81-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-84-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/1804-48-0x00000000336F0000-0x0000000033709000-memory.dmp

Filesize
100KB

Download
memory/1804-52-0x00000000336F0000-0x0000000033709000-memory.dmp

Filesize
100KB

Download
memory/2580-29-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2580-30-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2580-34-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2580-37-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2580-32-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2636-27-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2636-53-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2636-38-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2636-31-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2636-33-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2972-22-0x0000000002CC0000-0x00000000053ED000-memory.dmp

Filesize
39.2MB

Download
memory/2972-14-0x0000000002CC0000-0x00000000053ED000-memory.dmp

Filesize
39.2MB

Download
memory/2972-15-0x00000000779A0000-0x0000000077B49000-memory.dmp

Filesize
1.7MB

Download
memory/2972-13-0x00000000779A1000-0x0000000077AA2000-memory.dmp

Filesize
1.0MB

Download
memory/2972-12-0x0000000002CC0000-0x00000000053ED000-memory.dmp

Filesize
39.2MB

Download