juko | 40c8f2fae94e43cffeecac4d5e7055a228d7a09256b62d9f3d69048c9542069b

Analysis

max time kernel
149s
max time network
130s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
04/05/2026, 17:44

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General

Target
2026-05-04_7896d6cb4ab9233b01c75053fe1d469a_elex_wannacry.exe
Size 61KB
Sample260504-wbbemagy2w
SHA256 40c8f2fae94e43cffeecac4d5e7055a228d7a09256b62d9f3d69048c9542069b
MD5 7896d6cb4ab9233b01c75053fe1d469a
SHA1 4bad3db167e6d9455e71a9ae36f7db7d988eda33
SHA512 e7f57c8edf36cf0a192dc354f874abf65534011bae661c7f35ef71cb6075993eae27d4bc8f25861f0e7641993479fee7860c0d31116675a9b98bb98b67acebd4
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQm:yLy2Kerc64CiGImVZuyp8Tx
TLSH
T1FC532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/5196-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001b00000002ada9-5.dat	family_juko
behavioral2/memory/5196-13-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5068-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b357-17.dat	family_juko
behavioral2/memory/5052-19-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5052-28-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5068	WINWORD.exe
5052	WINWORD.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-1-5-21-650218026-1419908266-2856590055-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.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 7 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	2026-05-04_7896d6cb4ab9233b01c75053fe1d469a_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4120	PING.EXE
5112	cmd.exe
4268	PING.EXE
5008	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4268	PING.EXE
5008	PING.EXE
4120	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5196 wrote to memory of 5068	5196	2026-05-04_7896d6cb4ab9233b01c75053fe1d469a_elex_wannacry.exe	79
PID 5068 wrote to memory of 5112	5068	WINWORD.exe	80
PID 5112 wrote to memory of 4268	5112	cmd.exe	82
PID 5112 wrote to memory of 5008	5112	cmd.exe	83
PID 5112 wrote to memory of 4120	5112	cmd.exe	84
PID 5112 wrote to memory of 5052	5112	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-04_7896d6cb4ab9233b01c75053fe1d469a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_7896d6cb4ab9233b01c75053fe1d469a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5196
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5068
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\0000416A" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5112
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4268
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5008
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4120
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:5052

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000416A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000416A
Size 61KB
SHA256 e709c617caf467e90b6cbed7ec49001be521aface9dddff7f5496a730e77e46e
MD5 fa20f78aac9aabcbf272c81848aebe46
SHA1 14777d06fe3b86f9a8839568e83abda3a7fb3c6d
SHA512 020c85feb03dfb2a91f4cd01ea75fc3a0ee1a54c3050d52182d47f2f5fb2c6a4fd607b6c1129f7adf0c852a3de7fcc57dddaba9aaf6aedc395756038c0cd979a
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQx:yLy2Kerc64CiGImVZuyp8Ta
TLSH
T1C1532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 40c8f2fae94e43cffeecac4d5e7055a228d7a09256b62d9f3d69048c9542069b
MD5 7896d6cb4ab9233b01c75053fe1d469a
SHA1 4bad3db167e6d9455e71a9ae36f7db7d988eda33
SHA512 e7f57c8edf36cf0a192dc354f874abf65534011bae661c7f35ef71cb6075993eae27d4bc8f25861f0e7641993479fee7860c0d31116675a9b98bb98b67acebd4
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQm:yLy2Kerc64CiGImVZuyp8Tx
TLSH
T1FC532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5052-19-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5052-20-0x0000000000990000-0x0000000000A0B000-memory.dmp

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memory/5052-28-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5068-15-0x00000000009B0000-0x0000000000A2B000-memory.dmp

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memory/5068-16-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5196-0-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5196-13-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5196-12-0x0000000000860000-0x00000000008DB000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads