guloader | a2e1c896a7f478ad9613c5d267783ca4213a9d4b2167292bdd41e2e9e15e1ab4

General

Target

000_Scanned with Xerox Multifunction Printer.exe
Size

732KB
MD5

003a9a042df090f1501ac0c0c4fc0285
SHA1

0209a7f124455a7d5ea4c128b774a3fc3212917d
SHA256

a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d
SHA512

ba9a498692712ff48299da767aea61611bb72cddc372e35cbc309b9b7ffc0a5ce9eb451058c2a9ab610c5d2b74f879c025807734e2a873959212329dfa5fa4af
SSDEEP

12288:fJIbMYmuXv4CgC5Lbdje79l3/LBynrcPmMe9mukxD:fJYmuXv4hILZul3/Fkcbe9md

Score

10^/10

guloader remcos remotehost collection discovery downloader persistence rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

216.250.252.33:60309

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-TJ7QLN
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/3952-64-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1256-63-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3868-61-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/3952-58-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/1256-52-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3868-53-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/1256-68-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3868-61-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/3868-53-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/1256-63-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1256-52-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1256-68-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 1 IoCs

pid	Process
1052	000_Scanned with Xerox Multifunction Printer.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-1-5-21-1294999112-580688058-1763548717-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	000_Scanned with Xerox Multifunction Printer.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1294999112-580688058-1763548717-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Bremsebakke92 = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Acronomy\\Asymmetron.exe"	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2636	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1052	000_Scanned with Xerox Multifunction Printer.exe
2636	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2636 set thread context of 1256	2636	000_Scanned with Xerox Multifunction Printer.exe	87
PID 2636 set thread context of 3868	2636	000_Scanned with Xerox Multifunction Printer.exe	88
PID 2636 set thread context of 3952	2636	000_Scanned with Xerox Multifunction Printer.exe	89

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Redwing.ini	000_Scanned with Xerox Multifunction Printer.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\unstates.Kap233	000_Scanned with Xerox Multifunction Printer.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	000_Scanned with Xerox Multifunction Printer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	000_Scanned with Xerox Multifunction Printer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	000_Scanned with Xerox Multifunction Printer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	000_Scanned with Xerox Multifunction Printer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	000_Scanned with Xerox Multifunction Printer.exe

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral2/files/0x0008000000023cb2-24.dat	nsis_installer_1
behavioral2/files/0x0008000000023cb2-24.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1256	000_Scanned with Xerox Multifunction Printer.exe
1256	000_Scanned with Xerox Multifunction Printer.exe
3952	000_Scanned with Xerox Multifunction Printer.exe
3952	000_Scanned with Xerox Multifunction Printer.exe
1256	000_Scanned with Xerox Multifunction Printer.exe
1256	000_Scanned with Xerox Multifunction Printer.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
1052	000_Scanned with Xerox Multifunction Printer.exe
2636	000_Scanned with Xerox Multifunction Printer.exe
2636	000_Scanned with Xerox Multifunction Printer.exe
2636	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3952	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2636	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1052 wrote to memory of 2636	1052	000_Scanned with Xerox Multifunction Printer.exe	86
PID 1052 wrote to memory of 2636	1052	000_Scanned with Xerox Multifunction Printer.exe	86
PID 1052 wrote to memory of 2636	1052	000_Scanned with Xerox Multifunction Printer.exe	86
PID 1052 wrote to memory of 2636	1052	000_Scanned with Xerox Multifunction Printer.exe	86
PID 2636 wrote to memory of 1256	2636	000_Scanned with Xerox Multifunction Printer.exe	87
PID 2636 wrote to memory of 1256	2636	000_Scanned with Xerox Multifunction Printer.exe	87
PID 2636 wrote to memory of 1256	2636	000_Scanned with Xerox Multifunction Printer.exe	87
PID 2636 wrote to memory of 3868	2636	000_Scanned with Xerox Multifunction Printer.exe	88
PID 2636 wrote to memory of 3868	2636	000_Scanned with Xerox Multifunction Printer.exe	88
PID 2636 wrote to memory of 3868	2636	000_Scanned with Xerox Multifunction Printer.exe	88
PID 2636 wrote to memory of 3952	2636	000_Scanned with Xerox Multifunction Printer.exe	89
PID 2636 wrote to memory of 3952	2636	000_Scanned with Xerox Multifunction Printer.exe	89
PID 2636 wrote to memory of 3952	2636	000_Scanned with Xerox Multifunction Printer.exe	89

C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe
"C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1052
- C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe
  "C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe"
  2⤵
  - Adds Run key to start application
  - 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:2636
- - C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe
    "C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe" /stext "C:\Users\Admin\AppData\Local\Temp\innydbragnreqwsakph"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:1256
- - C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe
    "C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe" /stext "C:\Users\Admin\AppData\Local\Temp\lpsremctuvjjbcoecaubhz"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:3868
- - C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe
    "C:\Users\Admin\AppData\Local\Temp\000_Scanned with Xerox Multifunction Printer.exe" /stext "C:\Users\Admin\AppData\Local\Temp\vkfbeemvqdbodjcqlkodkmwcb"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3952

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

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:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
b1f43f6c48128c9616e7636f725aa33a

SHA1
6d4e82ba790e147bb5de3b7e50dcf2ead7db6fd5

SHA256
b8614187689984d1b85ef9b9f2708e36a71786c71de37fcaf43ad79cf2ae2805

SHA512
9fc4ade9ab680123e0c5e86434cbf0a349cefb17735276422d5a88041291e553df5878d10606299a08ad92a980837c6a08331d19b0831df5aaec6b1ad26e88fc

Download Submit
C:\Users\Admin\AppData\Local\Temp\Acronomy\Asymmetron.exe

Filesize
732KB

MD5
003a9a042df090f1501ac0c0c4fc0285

SHA1
0209a7f124455a7d5ea4c128b774a3fc3212917d

SHA256
a39ac5a508c71f482ed03ccaaf8bb799f73672fa49895f940f45051d3f5b838d

SHA512
ba9a498692712ff48299da767aea61611bb72cddc372e35cbc309b9b7ffc0a5ce9eb451058c2a9ab610c5d2b74f879c025807734e2a873959212329dfa5fa4af

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

Filesize
4KB

MD5
3dc6ac554259a12fbb27519148784087

SHA1
5254fbc3808a80deae0deef46bf35577b21d90cc

SHA256
0d313e61d7ae3255d8ee25700157af18c65b6393ab2daee12f4907fd275b2910

SHA512
5a394f05fce199518fc0b2370e2270254004a8818b2f3bfc47a736b83347080c5d2da8dbbee22c1d114886348546c02d8cff8b030fecfca7e1c46948ccc6b8ba

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsyB45F.tmp\System.dll

Filesize
11KB

MD5
a436db0c473a087eb61ff5c53c34ba27

SHA1
65ea67e424e75f5065132b539c8b2eda88aa0506

SHA256
75ed40311875312617d6711baed0be29fcaee71031ca27a8d308a72b15a51e49

SHA512
908f46a855480af6eacb2fb64de0e60b1e04bbb10b23992e2cf38a4cbebdcd7d3928c4c022d7ad9f7479265a8f426b93eef580afec95570e654c360d62f5e08d

Download Submit
memory/1052-18-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/1052-19-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/1052-20-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/1256-46-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1256-68-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1256-48-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1256-52-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1256-63-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2636-75-0x00000000363B0000-0x00000000363C9000-memory.dmp

Filesize
100KB

Download
memory/2636-21-0x00000000016D0000-0x0000000004B20000-memory.dmp

Filesize
52.3MB

Download
memory/2636-101-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-43-0x00000000016D0000-0x0000000004B20000-memory.dmp

Filesize
52.3MB

Download
memory/2636-98-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-95-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-92-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-89-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-39-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-86-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-83-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-44-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/2636-38-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-23-0x0000000077521000-0x0000000077641000-memory.dmp

Filesize
1.1MB

Download
memory/2636-71-0x00000000363B0000-0x00000000363C9000-memory.dmp

Filesize
100KB

Download
memory/2636-22-0x00000000775A8000-0x00000000775A9000-memory.dmp

Filesize
4KB

Download
memory/2636-74-0x00000000363B0000-0x00000000363C9000-memory.dmp

Filesize
100KB

Download
memory/2636-77-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2636-80-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/3868-51-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3868-49-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3868-53-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3868-61-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3952-54-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3952-56-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3952-58-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3952-64-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads