guloader | 547ffc87de4f0a1aa0c3031152ba6297e1b0aa81e41fa1d5f97a63318137206d

General

Target

c5aceb5a91bf991604daec67bde90bc7.exe
Size

658KB
MD5

c5aceb5a91bf991604daec67bde90bc7
SHA1

66f965774fbee77e43d089281366d1256b312386
SHA256

547ffc87de4f0a1aa0c3031152ba6297e1b0aa81e41fa1d5f97a63318137206d
SHA512

a774095ba9c245ecb217fabbcc3f5a37d9678ef1e304543834a54eb554fb0735b761957cd254c30b5ee0e73638c2992580fffe68b1aadb824e76a8b10c375a6e
SSDEEP

12288:8vPoJfNUnZjJd4Yuz366rLjW4aFdIge89hbL7TWxv69jIQS6lpOYCUjJ+C:8PQfNUnN4dKBdtZN7avBQTlpvCUz

Score

10^/10

guloader remcos rem_doc2 discovery downloader execution persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Rem_doc2

C2

107.173.4.16:2404

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-DSGECX
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

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2236	powershell.exe

Loads dropped DLL 2 IoCs

pid	Process
2236	powershell.exe
2764	salited.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-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\Startup key = "%Risalamands238% -windowstyle minimized $Handspring=(Get-ItemProperty -Path 'HKCU:\\armbroeste\\').Speedboat;%Risalamands238% ($Handspring)"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2764	salited.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2236	powershell.exe
2764	salited.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2236 set thread context of 2764	2236	powershell.exe	34

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\Noumenalize\solipsists.cru	c5aceb5a91bf991604daec67bde90bc7.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Fonts\Urim.ini	c5aceb5a91bf991604daec67bde90bc7.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	salited.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c5aceb5a91bf991604daec67bde90bc7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

T1112

pid	Process
1640	reg.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8	salited.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\ROOT\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8\Blob = 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	salited.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
2236	powershell.exe
2236	powershell.exe
2236	powershell.exe
2236	powershell.exe
2236	powershell.exe
2236	powershell.exe
2236	powershell.exe
2236	powershell.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2236	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2236	powershell.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1868 wrote to memory of 2236	1868	c5aceb5a91bf991604daec67bde90bc7.exe	30
PID 1868 wrote to memory of 2236	1868	c5aceb5a91bf991604daec67bde90bc7.exe	30
PID 1868 wrote to memory of 2236	1868	c5aceb5a91bf991604daec67bde90bc7.exe	30
PID 1868 wrote to memory of 2236	1868	c5aceb5a91bf991604daec67bde90bc7.exe	30
PID 2236 wrote to memory of 2764	2236	powershell.exe	34
PID 2236 wrote to memory of 2764	2236	powershell.exe	34
PID 2236 wrote to memory of 2764	2236	powershell.exe	34
PID 2236 wrote to memory of 2764	2236	powershell.exe	34
PID 2236 wrote to memory of 2764	2236	powershell.exe	34
PID 2236 wrote to memory of 2764	2236	powershell.exe	34
PID 2764 wrote to memory of 1884	2764	salited.exe	35
PID 2764 wrote to memory of 1884	2764	salited.exe	35
PID 2764 wrote to memory of 1884	2764	salited.exe	35
PID 2764 wrote to memory of 1884	2764	salited.exe	35
PID 1884 wrote to memory of 1640	1884	cmd.exe	37
PID 1884 wrote to memory of 1640	1884	cmd.exe	37
PID 1884 wrote to memory of 1640	1884	cmd.exe	37
PID 1884 wrote to memory of 1640	1884	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\c5aceb5a91bf991604daec67bde90bc7.exe
"C:\Users\Admin\AppData\Local\Temp\c5aceb5a91bf991604daec67bde90bc7.exe"
1⤵
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1868
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -windowstyle hidden "$Lysintensiteters=Get-Content 'C:\Users\Admin\AppData\Roaming\euthanasic\satineredes\Gammastraales\Maxiernes95\Rabarbergrden.Afm';$Chunderous=$Lysintensiteters.SubString(56880,3);.$Chunderous($Lysintensiteters)"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Loads dropped DLL
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2236
- - C:\Users\Admin\AppData\Local\Temp\salited.exe
    "C:\Users\Admin\AppData\Local\Temp\salited.exe"
    3⤵
    - Loads dropped DLL
    - Suspicious use of NtCreateThreadExHideFromDebugger
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - System Location Discovery: System Language Discovery
    - Modifies system certificate store
    - Suspicious use of WriteProcessMemory
    PID:2764
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Startup key" /t REG_EXPAND_SZ /d "%Risalamands238% -windowstyle minimized $Handspring=(Get-ItemProperty -Path 'HKCU:\armbroeste\').Speedboat;%Risalamands238% ($Handspring)"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1884
    - - C:\Windows\SysWOW64\reg.exe
        
        REG ADD HKCU\Software\Microsoft\Windows\CurrentVersion\Run /f /v "Startup key" /t REG_EXPAND_SZ /d "%Risalamands238% -windowstyle minimized $Handspring=(Get-ItemProperty -Path 'HKCU:\armbroeste\').Speedboat;%Risalamands238% ($Handspring)"
        5⤵
        Adds Run key to start application
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:1640

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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

3

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\euthanasic\satineredes\Gammastraales\Kordon.int

Filesize
314KB

MD5
bdfb00f48094664301b955139669444b

SHA1
13dfa5fe6afabe51641e7080a73de52381544382

SHA256
958388d7d8f5b6d68e801d8d597a6627c8cf63daf87cc9baa35bd0e5d270cfad

SHA512
5490f651b643a7b3d0a2d501634dede26f481cde57123e3c6f942620adb3e72afbb266c262bb305545df58746832a1611946c8fcdd3a464c30d424658379960b

Download Submit
C:\Users\Admin\AppData\Roaming\euthanasic\satineredes\Gammastraales\Maxiernes95\Rabarbergrden.Afm

Filesize
55KB

MD5
008e87be411ded72a46511a077bc91f1

SHA1
3ecdaa325cdad56e51b8799caee08d7d6c670bf7

SHA256
a635b01f4ecc32a646bc2ad4eac2261ced6dced764427e4d7900c1bed66d874f

SHA512
06da3f805dff9bc503f6e7507165362af82884023c77121c0057ab0f260311772e3efc72af6641b16543ad734aced21825db065d9109e1354066b70bf14c06a9

Download Submit
\Users\Admin\AppData\Local\Temp\salited.exe

Filesize
658KB

MD5
c5aceb5a91bf991604daec67bde90bc7

SHA1
66f965774fbee77e43d089281366d1256b312386

SHA256
547ffc87de4f0a1aa0c3031152ba6297e1b0aa81e41fa1d5f97a63318137206d

SHA512
a774095ba9c245ecb217fabbcc3f5a37d9678ef1e304543834a54eb554fb0735b761957cd254c30b5ee0e73638c2992580fffe68b1aadb824e76a8b10c375a6e

Download Submit
memory/2236-17-0x0000000073900000-0x0000000073EAB000-memory.dmp

Filesize
5.7MB

Download
memory/2236-12-0x0000000073900000-0x0000000073EAB000-memory.dmp

Filesize
5.7MB

Download
memory/2236-11-0x0000000073900000-0x0000000073EAB000-memory.dmp

Filesize
5.7MB

Download
memory/2236-15-0x0000000073900000-0x0000000073EAB000-memory.dmp

Filesize
5.7MB

Download
memory/2236-10-0x0000000073900000-0x0000000073EAB000-memory.dmp

Filesize
5.7MB

Download
memory/2236-8-0x0000000073901000-0x0000000073902000-memory.dmp

Filesize
4KB

Download
memory/2236-18-0x00000000065C0000-0x0000000008B70000-memory.dmp

Filesize
37.7MB

Download
memory/2236-19-0x0000000073900000-0x0000000073EAB000-memory.dmp

Filesize
5.7MB

Download
memory/2236-9-0x0000000073900000-0x0000000073EAB000-memory.dmp

Filesize
5.7MB

Download
memory/2764-23-0x00000000014F0000-0x0000000003AA0000-memory.dmp

Filesize
37.7MB

Download
memory/2764-25-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2764-40-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download
memory/2764-44-0x0000000000480000-0x00000000014E2000-memory.dmp

Filesize
16.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads