juko | 58dafa93ca2963e8d43a94c3c7aa0020d5cd07007f5cfc38455fc3b587fbc0c8

General

Target
2026-09-04_90d075ad9286a78d98ebdfe100ab74da_elex_wannacry.exe
Size 57KB
Sample260905-d3lesssxhw
SHA256 58dafa93ca2963e8d43a94c3c7aa0020d5cd07007f5cfc38455fc3b587fbc0c8
MD5 90d075ad9286a78d98ebdfe100ab74da
SHA1 9138e67f78d8af8c5f857204d0ad7daf7bd627f5
SHA512 0f10f941618464d182f631467c5fe2202a6910c5e5c34f9b022a28392f99d22895ca25b5839a245b55270f069249b8d4f4cb6db5b976fdc40226e284387931d8
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa+:wLy2Kerc64CiGImEsoDfa+
TLSH
T1D6433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4344-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000800000001b888-5.dat	family_juko
behavioral2/memory/4344-9-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/5088-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c52b-13.dat	family_juko
behavioral2/memory/1328-15-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/1328-16-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5088	WINWORD.exe
1328	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-1-5-21-552508041-2681165170-3229858294-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
1420	cmd.exe

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-04_90d075ad9286a78d98ebdfe100ab74da_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

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
1420	cmd.exe
5860	PING.EXE
4088	PING.EXE
3588	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5860	PING.EXE
4088	PING.EXE
3588	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4344 wrote to memory of 5088	4344	2026-09-04_90d075ad9286a78d98ebdfe100ab74da_elex_wannacry.exe	89
PID 5088 wrote to memory of 1420	5088	WINWORD.exe	90
PID 1420 wrote to memory of 5860	1420	cmd.exe	92
PID 1420 wrote to memory of 4088	1420	cmd.exe	93
PID 1420 wrote to memory of 3588	1420	cmd.exe	94
PID 1420 wrote to memory of 1328	1420	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-04_90d075ad9286a78d98ebdfe100ab74da_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_90d075ad9286a78d98ebdfe100ab74da_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4344
- 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:5088
- - 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\00004454" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:1420
  - - 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:5860
  - - 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:4088
  - - 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:3588
  - - 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:1328

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

Discovery

Remote System Discovery

1

T1018

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

Command and Control

Exfiltration

Impact

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Downloads

00004454

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004454
Size 57KB
SHA256 4f14ed32c5b2f906db6683b19f940a027b4af8449800b6c0b93bcde1e2d71097
MD5 edf434ac79ed40357a3d7ffd3ca7d90c
SHA1 0b034117b0ba3943c00bd74f39cb095255dcd843
SHA512 e9544c12db797bd40c0b0cd32e3de85e551868ad8f1b3a6059c4e448fc9a0fb13185ecf96cbc5387b1b7cd35db272fc8dce946fc88779f72a233d976391b1d7f
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaG:wLy2Kerc64CiGImEsoDfaG
TLSH
T16D433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 58dafa93ca2963e8d43a94c3c7aa0020d5cd07007f5cfc38455fc3b587fbc0c8
MD5 90d075ad9286a78d98ebdfe100ab74da
SHA1 9138e67f78d8af8c5f857204d0ad7daf7bd627f5
SHA512 0f10f941618464d182f631467c5fe2202a6910c5e5c34f9b022a28392f99d22895ca25b5839a245b55270f069249b8d4f4cb6db5b976fdc40226e284387931d8
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa+:wLy2Kerc64CiGImEsoDfa+
TLSH
T1D6433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1328-15-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/1328-16-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4344-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4344-9-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5088-12-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads