skuld | f31b0285f3bccd657e9b591732186a807584901d2ab8924897fa679ed1b39a1b

Analysis

max time kernel
140s
max time network
146s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
28/11/2024, 03:02

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General

Target

EzFN-Manager.exe
Size

3.8MB
MD5

2edfa42f0313ebe2b05d0d3961deaf3b
SHA1

82ba26770f8a59297e668a6ca95b4049c82b67e3
SHA256

f31b0285f3bccd657e9b591732186a807584901d2ab8924897fa679ed1b39a1b
SHA512

4bfe9e9766677aaf6e630ec8e653f9d61a75677e34b15661f3f04889b5c1397d9e06fb2e81bf7cda1e46fd00139528a4412278b6882ffcf78278ab0a69714378
SSDEEP

49152:GQyw/FgZl3Vslwr1ymub72iQkxDonnrxxxqNWN/l4itPBFGsDJjr6uas4:yw/K33VslU8zQkxkrhNzXZDFFZ4

Score

10^/10

skuld xworm discovery execution persistence rat stealer trojan upx

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1309150098055495793/k9e9xgOw-6_C2plzzrJuXKnk0n6rjOfFwyNN15kYdvJC528Av5hMa6QHDC_kqeEBzjsS

Extracted

Family

xworm

Version

5.0

ezfn57.serveo.net:4782

Mutex

s6QNsQsMG6xRRrJT

Attributes

Install_directory
%ProgramData%
install_file
WinRar.exe

aes.plain

Signatures

Detect Xworm Payload 8 IoCs

resource	yara_rule
behavioral1/memory/2972-36-0x0000000000400000-0x0000000000438000-memory.dmp	family_xworm
behavioral1/memory/2972-34-0x0000000000400000-0x0000000000438000-memory.dmp	family_xworm
behavioral1/memory/2972-32-0x0000000000400000-0x0000000000438000-memory.dmp	family_xworm
behavioral1/memory/2972-29-0x0000000000400000-0x0000000000438000-memory.dmp	family_xworm
behavioral1/memory/2972-27-0x0000000000400000-0x0000000000438000-memory.dmp	family_xworm
behavioral1/memory/2428-80-0x0000000000080000-0x00000000000B8000-memory.dmp	family_xworm
behavioral1/memory/2428-77-0x0000000000080000-0x00000000000B8000-memory.dmp	family_xworm
behavioral1/memory/2428-73-0x0000000000080000-0x00000000000B8000-memory.dmp	family_xworm

Skuld family
skuld
Skuld stealer
An info stealer written in Go lang.
stealer skuld
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1736	powershell.exe
316	powershell.exe
1980	powershell.exe
2656	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\WinRar.lnk	WinRAR.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\WinRar.lnk	WinRAR.exe

Executes dropped EXE 7 IoCs

pid	Process
2968	WinRAR.exe
640	Microsoft Teams.exe
2972	WinRAR.exe
1844	WinRar.exe
2428	WinRar.exe
332	WinRar.exe
1720	WinRar.exe

Loads dropped DLL 3 IoCs

pid	Process
2248	EzFN-Manager.exe
2248	EzFN-Manager.exe
2972	WinRAR.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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\WinRar = "C:\\ProgramData\\WinRar.exe"	WinRAR.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	ip-api.com

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2968 set thread context of 2972	2968	WinRAR.exe	33
PID 1844 set thread context of 2428	1844	WinRar.exe	47
PID 332 set thread context of 1720	332	WinRar.exe	49

UPX packed file 3 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/files/0x0031000000018bbf-10.dat	upx
behavioral1/memory/640-17-0x0000000000810000-0x0000000001275000-memory.dmp	upx
behavioral1/memory/640-20-0x0000000000810000-0x0000000001275000-memory.dmp	upx

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 11 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinRAR.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinRAR.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinRar.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinRar.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinRar.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WinRar.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1776	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1736	powershell.exe
316	powershell.exe
1980	powershell.exe
2656	powershell.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeDebugPrivilege	2968	WinRAR.exe
Token: SeDebugPrivilege	2972	WinRAR.exe
Token: SeDebugPrivilege	1736	powershell.exe
Token: SeDebugPrivilege	316	powershell.exe
Token: SeDebugPrivilege	1980	powershell.exe
Token: SeDebugPrivilege	2656	powershell.exe
Token: SeDebugPrivilege	2972	WinRAR.exe
Token: SeDebugPrivilege	1844	WinRar.exe
Token: SeDebugPrivilege	2428	WinRar.exe
Token: SeDebugPrivilege	332	WinRar.exe
Token: SeDebugPrivilege	1720	WinRar.exe

Suspicious use of WriteProcessMemory 62 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 2968	2248	EzFN-Manager.exe	30
PID 2248 wrote to memory of 2968	2248	EzFN-Manager.exe	30
PID 2248 wrote to memory of 2968	2248	EzFN-Manager.exe	30
PID 2248 wrote to memory of 2968	2248	EzFN-Manager.exe	30
PID 2248 wrote to memory of 640	2248	EzFN-Manager.exe	31
PID 2248 wrote to memory of 640	2248	EzFN-Manager.exe	31
PID 2248 wrote to memory of 640	2248	EzFN-Manager.exe	31
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2968 wrote to memory of 2972	2968	WinRAR.exe	33
PID 2972 wrote to memory of 1736	2972	WinRAR.exe	35
PID 2972 wrote to memory of 1736	2972	WinRAR.exe	35
PID 2972 wrote to memory of 1736	2972	WinRAR.exe	35
PID 2972 wrote to memory of 1736	2972	WinRAR.exe	35
PID 2972 wrote to memory of 316	2972	WinRAR.exe	37
PID 2972 wrote to memory of 316	2972	WinRAR.exe	37
PID 2972 wrote to memory of 316	2972	WinRAR.exe	37
PID 2972 wrote to memory of 316	2972	WinRAR.exe	37
PID 2972 wrote to memory of 1980	2972	WinRAR.exe	39
PID 2972 wrote to memory of 1980	2972	WinRAR.exe	39
PID 2972 wrote to memory of 1980	2972	WinRAR.exe	39
PID 2972 wrote to memory of 1980	2972	WinRAR.exe	39
PID 2972 wrote to memory of 2656	2972	WinRAR.exe	41
PID 2972 wrote to memory of 2656	2972	WinRAR.exe	41
PID 2972 wrote to memory of 2656	2972	WinRAR.exe	41
PID 2972 wrote to memory of 2656	2972	WinRAR.exe	41
PID 2972 wrote to memory of 1776	2972	WinRAR.exe	43
PID 2972 wrote to memory of 1776	2972	WinRAR.exe	43
PID 2972 wrote to memory of 1776	2972	WinRAR.exe	43
PID 2972 wrote to memory of 1776	2972	WinRAR.exe	43
PID 2424 wrote to memory of 1844	2424	taskeng.exe	46
PID 2424 wrote to memory of 1844	2424	taskeng.exe	46
PID 2424 wrote to memory of 1844	2424	taskeng.exe	46
PID 2424 wrote to memory of 1844	2424	taskeng.exe	46
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 1844 wrote to memory of 2428	1844	WinRar.exe	47
PID 2424 wrote to memory of 332	2424	taskeng.exe	48
PID 2424 wrote to memory of 332	2424	taskeng.exe	48
PID 2424 wrote to memory of 332	2424	taskeng.exe	48
PID 2424 wrote to memory of 332	2424	taskeng.exe	48
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49
PID 332 wrote to memory of 1720	332	WinRar.exe	49

C:\Users\Admin\AppData\Local\Temp\EzFN-Manager.exe
"C:\Users\Admin\AppData\Local\Temp\EzFN-Manager.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2248
- C:\Users\Admin\AppData\Roaming\WinRAR.exe
  "C:\Users\Admin\AppData\Roaming\WinRAR.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2968
- - C:\Users\Admin\AppData\Roaming\WinRAR.exe
    "C:\Users\Admin\AppData\Roaming\WinRAR.exe"
    3⤵
    - Drops startup file
    - Executes dropped EXE
    - Loads dropped DLL
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2972
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\WinRAR.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1736
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'WinRAR.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:316
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\WinRar.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1980
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'WinRar.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2656
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "WinRar" /tr "C:\ProgramData\WinRar.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:1776
- C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft Teams.exe"
  2⤵
  - Executes dropped EXE
  PID:640

C:\Windows\system32\taskeng.exe
taskeng.exe {C3B3DE79-BA4C-4F6A-A385-17B98D882A3F} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2424
- C:\ProgramData\WinRar.exe
  C:\ProgramData\WinRar.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1844
- - C:\ProgramData\WinRar.exe
    "C:\ProgramData\WinRar.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2428
- C:\ProgramData\WinRar.exe
  C:\ProgramData\WinRar.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:332
- - C:\ProgramData\WinRar.exe
    "C:\ProgramData\WinRar.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1720

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

Filesize
7KB

MD5
2ae601a6ce933b1456ab56fd9c4ebff7

SHA1
57b593213a9bda953cb6f74b8f896590b06e3919

SHA256
6000093d71d13078b906467c5cd4cb26ae19a5f35cf9cb5a4a9b0383eab6efbf

SHA512
ece400f55458b639d7aad50f758402a0e5f55e618ac8c3c7bb45472fb30c6bd2d90c5b8324a94c2d5a77f2cc1f1ed7b80b87538d7914c07c97c4677773d9de26

Download Submit
C:\Users\Admin\AppData\Roaming\WinRAR.exe

Filesize
379KB

MD5
49129093416a454d99955d5ac0eea133

SHA1
587263d5c272c0a351aa5d2d5818e1c317c5f712

SHA256
fd1aa71f521f8d6bccda3129f55960d844e5b7dd2374476cc6693df4d1d7ebf7

SHA512
1958d9c48e1900d2854134c7df9772d3fca7af8020b22916d94931b814a0ca4f9b2e9a92cdefa1c5ff5338d72d122ee6485b649ef6db2268cccc105a42e9ff70

Download Submit
\Users\Admin\AppData\Roaming\Microsoft Teams.exe

Filesize
3.3MB

MD5
ffa33049612a638a2f40c2a89722a6f4

SHA1
a453ea7f4c26dbe56d547988d8afe5fbf642e7df

SHA256
589e6cc7481b257d46466116096f4df95a41daaca908a661a528dd3b658e4ea2

SHA512
e7f05a846dd9cdf20f1330569974b4b2f677f34e74b32964836c6c38b6902c25109dea3259b64543a525a4af49bfb9011ad58365d6c597bc78f99f84aa79c927

Download Submit
memory/332-83-0x0000000000220000-0x0000000000284000-memory.dmp

Filesize
400KB

Download
memory/640-17-0x0000000000810000-0x0000000001275000-memory.dmp

Filesize
10.4MB

Download
memory/640-20-0x0000000000810000-0x0000000001275000-memory.dmp

Filesize
10.4MB

Download
memory/1720-92-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1844-61-0x0000000000A90000-0x0000000000AF4000-memory.dmp

Filesize
400KB

Download
memory/2248-18-0x000000001BAD0000-0x000000001C535000-memory.dmp

Filesize
10.4MB

Download
memory/2248-1-0x0000000000FF0000-0x00000000013C6000-memory.dmp

Filesize
3.8MB

Download
memory/2248-16-0x000000001BAD0000-0x000000001C535000-memory.dmp

Filesize
10.4MB

Download
memory/2248-22-0x000000001BAD0000-0x000000001C535000-memory.dmp

Filesize
10.4MB

Download
memory/2248-0-0x000007FEF5B13000-0x000007FEF5B14000-memory.dmp

Filesize
4KB

Download
memory/2428-73-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/2428-77-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/2428-80-0x0000000000080000-0x00000000000B8000-memory.dmp

Filesize
224KB

Download
memory/2428-70-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2968-21-0x0000000000E80000-0x0000000000EE4000-memory.dmp

Filesize
400KB

Download
memory/2972-32-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2972-23-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2972-27-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2972-29-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2972-31-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2972-34-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2972-36-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2972-25-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download