juko | 407aa614b00eb980b4bd47fadb76c35abfb9faa5a1ad9d1c928c29a9ce55f7fa

General

Target
2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe
Size 87KB
Sample260422-dgd4labx71
SHA256 407aa614b00eb980b4bd47fadb76c35abfb9faa5a1ad9d1c928c29a9ce55f7fa
MD5 5c1d9fbcffb0b0a0ba45966d49bbfe39
SHA1 baa1cbb5306654b30d26d05d3a23c12052a3a0ed
SHA512 301504b9c19f44e8e2c31b1a3926ee6288df6f1cecd3eda8c583c7a50c22d6ad3451b33e519b3cba12d3601a2528e6850a7358114ca379fa449c2f79ef90b09d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpT:2Ly2Kerc64CiGIm1K851YO6EQkwpT
TLSH
T16793A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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
behavioral1/memory/2112-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0005000000023071-5.dat	family_juko
behavioral1/memory/2112-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3496-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00090000000243a5-15.dat	family_juko
behavioral1/memory/5044-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/5044-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-745935970-1373868228-562466063-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-745935970-1373868228-562466063-1000\Control Panel\International\Geo\Nation	2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3496	WINWORD.exe
5044	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-1-5-21-745935970-1373868228-562466063-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.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
4744	PING.EXE
3972	PING.EXE
4972	PING.EXE
1952	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4744	PING.EXE
3972	PING.EXE
4972	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2112 wrote to memory of 3496	2112	2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe	85
PID 3496 wrote to memory of 1952	3496	WINWORD.exe	86
PID 1952 wrote to memory of 4744	1952	cmd.exe	88
PID 1952 wrote to memory of 3972	1952	cmd.exe	89
PID 1952 wrote to memory of 4972	1952	cmd.exe	90
PID 1952 wrote to memory of 5044	1952	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-22_5c1d9fbcffb0b0a0ba45966d49bbfe39_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2112
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3496
- - 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\00006080" 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:1952
  - - 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:4744
  - - 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:3972
  - - 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:4972
  - - 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:5044

Network

MITRE ATT&CK Enterprise v16

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

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00006080

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006080
Size 87KB
SHA256 8042e34ddae2a3fb48b5ded833208e6d52f9687f74a8daab3930e3fd31bab704
MD5 89ce1905765a912245573e156239d7e3
SHA1 3b5abbcc18a72ff519c28e3d7db795abba710778
SHA512 edf504832ed4f6e193da3d4510ba7836c5371d8729705655e690527e0933ca6a7d038deee2d534061f1d80212942b2135faa852d292eb6e5c20c94abb647438b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp2:2Ly2Kerc64CiGIm1K851YO6EQkwp2
TLSH
T1E093A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 407aa614b00eb980b4bd47fadb76c35abfb9faa5a1ad9d1c928c29a9ce55f7fa
MD5 5c1d9fbcffb0b0a0ba45966d49bbfe39
SHA1 baa1cbb5306654b30d26d05d3a23c12052a3a0ed
SHA512 301504b9c19f44e8e2c31b1a3926ee6288df6f1cecd3eda8c583c7a50c22d6ad3451b33e519b3cba12d3601a2528e6850a7358114ca379fa449c2f79ef90b09d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpT:2Ly2Kerc64CiGIm1K851YO6EQkwpT
TLSH
T16793A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2112-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2112-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3496-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5044-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5044-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads