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 6 IoCs

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

resource	yara_rule
behavioral2/memory/4160-62-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4160-64-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/460-60-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/460-56-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/2968-55-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/2968-70-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/460-60-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/460-56-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/2968-55-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/2968-70-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Downloads MZ/PE file 1 IoCs

flow	pid	Process
46	4836	Process not Found

Loads dropped DLL 1 IoCs

pid	Process
2868	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-1-5-21-2508704002-2325818048-3575902788-1000\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-1-5-21-2508704002-2325818048-3575902788-1000\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
2140	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2868	000_Scanned with Xerox Multifunction Printer.exe
2140	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2140 set thread context of 2968	2140	000_Scanned with Xerox Multifunction Printer.exe	102
PID 2140 set thread context of 460	2140	000_Scanned with Xerox Multifunction Printer.exe	103
PID 2140 set thread context of 4160	2140	000_Scanned with Xerox Multifunction Printer.exe	104

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 6 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	MicrosoftEdgeUpdate.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

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1416	MicrosoftEdgeUpdate.exe

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral2/files/0x000300000001eba2-25.dat	nsis_installer_1
behavioral2/files/0x000300000001eba2-25.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2968	000_Scanned with Xerox Multifunction Printer.exe
2968	000_Scanned with Xerox Multifunction Printer.exe
4160	000_Scanned with Xerox Multifunction Printer.exe
4160	000_Scanned with Xerox Multifunction Printer.exe
2968	000_Scanned with Xerox Multifunction Printer.exe
2968	000_Scanned with Xerox Multifunction Printer.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
2868	000_Scanned with Xerox Multifunction Printer.exe
2140	000_Scanned with Xerox Multifunction Printer.exe
2140	000_Scanned with Xerox Multifunction Printer.exe
2140	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4160	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2140	000_Scanned with Xerox Multifunction Printer.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 2868 wrote to memory of 2140	2868	000_Scanned with Xerox Multifunction Printer.exe	94
PID 2868 wrote to memory of 2140	2868	000_Scanned with Xerox Multifunction Printer.exe	94
PID 2868 wrote to memory of 2140	2868	000_Scanned with Xerox Multifunction Printer.exe	94
PID 2868 wrote to memory of 2140	2868	000_Scanned with Xerox Multifunction Printer.exe	94
PID 2140 wrote to memory of 2968	2140	000_Scanned with Xerox Multifunction Printer.exe	102
PID 2140 wrote to memory of 2968	2140	000_Scanned with Xerox Multifunction Printer.exe	102
PID 2140 wrote to memory of 2968	2140	000_Scanned with Xerox Multifunction Printer.exe	102
PID 2140 wrote to memory of 460	2140	000_Scanned with Xerox Multifunction Printer.exe	103
PID 2140 wrote to memory of 460	2140	000_Scanned with Xerox Multifunction Printer.exe	103
PID 2140 wrote to memory of 460	2140	000_Scanned with Xerox Multifunction Printer.exe	103
PID 2140 wrote to memory of 4160	2140	000_Scanned with Xerox Multifunction Printer.exe	104
PID 2140 wrote to memory of 4160	2140	000_Scanned with Xerox Multifunction Printer.exe	104
PID 2140 wrote to memory of 4160	2140	000_Scanned with Xerox Multifunction Printer.exe	104

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:2868
- 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:2140
- - 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\uyqlkkhsuebjshqsmcrajyseeolch"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:2968
- - 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\esveldrmqmtvcveweneuulenndvdaivi"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:460
- - 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\gviom"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4160

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI1IiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODMyMzYiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1NDI1MTE0ODAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MTAzNjEyODAzIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:1416

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

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
7e460839386207acbe54db88ee465ffb

SHA1
c3929cc17f9a3049d7470ef55411771e742f1d66

SHA256
4479132cd14f10e2511eebd40eb88d1014ede8414cd1078d51579d0a141be4bf

SHA512
7ef1c1b2b90bf5805104e7c55d7e4481402a75508c8a4e51f828d1691c98918647904708cb546b2186cda25132930ef23d8f98649b5bbd3594a91b2325f0084f

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\nseC305.tmp\System.dll

Filesize
11KB

MD5
a436db0c473a087eb61ff5c53c34ba27

SHA1
65ea67e424e75f5065132b539c8b2eda88aa0506

SHA256
75ed40311875312617d6711baed0be29fcaee71031ca27a8d308a72b15a51e49

SHA512
908f46a855480af6eacb2fb64de0e60b1e04bbb10b23992e2cf38a4cbebdcd7d3928c4c022d7ad9f7479265a8f426b93eef580afec95570e654c360d62f5e08d

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

Filesize
4KB

MD5
b128cff1b86211226528164cdc1295f3

SHA1
31c166d88683096510bce341ed0ebd3e73ee547f

SHA256
220cce2073f07060b61e6beba9404ca6ff6639d82fdb5cd1131463d65d441253

SHA512
c8533a2db66c5fa07c6a493137ef6b02e96944e69cf7808daa76e6b490a7d229df5e6192b8f87e3282be7602d8930db545dee80a78a473b2ec0b5594e5f9dfcb

Download Submit
memory/460-52-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/460-56-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/460-60-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/460-54-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/2140-45-0x00000000016D0000-0x0000000004B20000-memory.dmp

Filesize
52.3MB

Download
memory/2140-21-0x00000000016D0000-0x0000000004B20000-memory.dmp

Filesize
52.3MB

Download
memory/2140-47-0x00000000775F1000-0x0000000077711000-memory.dmp

Filesize
1.1MB

Download
memory/2140-46-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-100-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-97-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-24-0x00000000775F1000-0x0000000077711000-memory.dmp

Filesize
1.1MB

Download
memory/2140-94-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-91-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-88-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-23-0x0000000077678000-0x0000000077679000-memory.dmp

Filesize
4KB

Download
memory/2140-82-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-85-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-79-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-76-0x0000000036380000-0x0000000036399000-memory.dmp

Filesize
100KB

Download
memory/2140-41-0x0000000000470000-0x00000000016C4000-memory.dmp

Filesize
18.3MB

Download
memory/2140-77-0x0000000036380000-0x0000000036399000-memory.dmp

Filesize
100KB

Download
memory/2140-73-0x0000000036380000-0x0000000036399000-memory.dmp

Filesize
100KB

Download
memory/2868-19-0x00000000775F1000-0x0000000077711000-memory.dmp

Filesize
1.1MB

Download
memory/2868-20-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/2868-18-0x00000000775F1000-0x0000000077711000-memory.dmp

Filesize
1.1MB

Download
memory/2968-70-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2968-55-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2968-53-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2968-51-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4160-58-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4160-61-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4160-64-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4160-62-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads