guloader | cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8

General

Target

cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Size

501KB
MD5

4c906f03f8cbdcd7c66a15f6c8498330
SHA1

91e1270fc52b760ff2913f2db910f78c6051b74d
SHA256

cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8
SHA512

2ca1a394952bf0cef296f9015585b9a3bc261958350ed19e43adc4e778050320d46ac7f1854093f330a4000e4123361765769db2a569f93750f917e10564f717
SSDEEP

12288:pbZxvzlLYN4fYSq7UpiiArc3mYAR27YAC1/:xZxpflpiFymHR2bI

Score

10^/10

guloader remcos remotehost collection credential_access discovery downloader rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

102.165.14.28:26000

102.165.14.28:27000

102.165.14.28:28000

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-0V7E34
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 7 IoCs

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

resource	yara_rule
behavioral1/memory/2620-40-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/3004-46-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/3060-45-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/3060-42-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral1/memory/3004-47-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral1/memory/2620-53-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral1/memory/3060-56-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/3060-45-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral1/memory/3060-42-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral1/memory/3060-56-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral1/memory/2620-40-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral1/memory/2620-53-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 2 IoCs

pid	Process
2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.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-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

pid	Process
2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2328 set thread context of 2748	2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	31
PID 2748 set thread context of 2620	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	33
PID 2748 set thread context of 3060	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	34
PID 2748 set thread context of 3004	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	35

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\Computerskrift\Skrabnsers180.Ope72	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.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 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	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2620	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2620	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3004	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2328 wrote to memory of 2748	2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	31
PID 2328 wrote to memory of 2748	2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	31
PID 2328 wrote to memory of 2748	2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	31
PID 2328 wrote to memory of 2748	2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	31
PID 2328 wrote to memory of 2748	2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	31
PID 2328 wrote to memory of 2748	2328	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	31
PID 2748 wrote to memory of 2620	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	33
PID 2748 wrote to memory of 2620	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	33
PID 2748 wrote to memory of 2620	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	33
PID 2748 wrote to memory of 2620	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	33
PID 2748 wrote to memory of 3060	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	34
PID 2748 wrote to memory of 3060	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	34
PID 2748 wrote to memory of 3060	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	34
PID 2748 wrote to memory of 3060	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	34
PID 2748 wrote to memory of 3004	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	35
PID 2748 wrote to memory of 3004	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	35
PID 2748 wrote to memory of 3004	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	35
PID 2748 wrote to memory of 3004	2748	cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe	35

C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
"C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2328
- C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
  "C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.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 WriteProcessMemory
  PID:2748
- - C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
    C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe /stext "C:\Users\Admin\AppData\Local\Temp\wtpkbbddcbogjvhuvlpfvspiekzzxjnq"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:2620
- - C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
    C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe /stext "C:\Users\Admin\AppData\Local\Temp\hvudc"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:3060
- - C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe
    C:\Users\Admin\AppData\Local\Temp\cff42a20c90a525f62cf6c71c7362a9b94765f00f25c29faa20f2a0d67090ba8.exe /stext "C:\Users\Admin\AppData\Local\Temp\jqzvdmzy"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3004

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\wtpkbbddcbogjvhuvlpfvspiekzzxjnq

Filesize
2B

MD5
f3b25701fe362ec84616a93a45ce9998

SHA1
d62636d8caec13f04e28442a0a6fa1afeb024bbb

SHA256
b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

SHA512
98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

Download Submit
\Users\Admin\AppData\Local\Temp\nsoDF87.tmp\System.dll

Filesize
11KB

MD5
9625d5b1754bc4ff29281d415d27a0fd

SHA1
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0

SHA256
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448

SHA512
dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b

Download Submit
memory/2328-27-0x0000000003BE0000-0x0000000006740000-memory.dmp

Filesize
43.4MB

Download
memory/2328-28-0x0000000076EC1000-0x0000000076FC2000-memory.dmp

Filesize
1.0MB

Download
memory/2328-29-0x0000000076EC0000-0x0000000077069000-memory.dmp

Filesize
1.7MB

Download
memory/2328-30-0x0000000003BE0000-0x0000000006740000-memory.dmp

Filesize
43.4MB

Download
memory/2328-34-0x0000000003BE0000-0x0000000006740000-memory.dmp

Filesize
43.4MB

Download
memory/2620-40-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2620-38-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2620-53-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2620-36-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2748-31-0x0000000076EC0000-0x0000000077069000-memory.dmp

Filesize
1.7MB

Download
memory/2748-58-0x0000000033F70000-0x0000000033F89000-memory.dmp

Filesize
100KB

Download
memory/2748-61-0x0000000033F70000-0x0000000033F89000-memory.dmp

Filesize
100KB

Download
memory/2748-62-0x0000000033F70000-0x0000000033F89000-memory.dmp

Filesize
100KB

Download
memory/2748-33-0x0000000001870000-0x00000000043D0000-memory.dmp

Filesize
43.4MB

Download
memory/2748-32-0x0000000000800000-0x0000000001862000-memory.dmp

Filesize
16.4MB

Download
memory/3004-46-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3004-41-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3004-47-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3004-43-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3004-44-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3060-39-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3060-42-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3060-56-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3060-45-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3060-37-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download

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