juko | 32756d41601377b59afaa3f6075c2a9fbd42b212935a69912570d6d0ab66b8d0

General

Target
2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe
Size 222KB
Sample260515-1a1eksgs8x
SHA256 32756d41601377b59afaa3f6075c2a9fbd42b212935a69912570d6d0ab66b8d0
MD5 e72b752a76d6364e4a7f95560f2b6ad4
SHA1 81dd8b2e1c20cba76542973914048a92b1bc3bc3
SHA512 709521cf6af9c7d276419e7a5c05cbddfa269cdade5362639d1124c5fd707c6202059c34844bfd9805cc64bbda35f03c9d7a405df5e7b2434afa18f332c6862b
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokY:WkwcERoA28wzmJje7RsHcUTY
TLSH
T187245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
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 6 IoCs

resource	yara_rule
behavioral1/memory/1572-0-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral1/files/0x000b00000002423c-5.dat	family_juko
behavioral1/memory/1572-12-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral1/memory/4412-14-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral1/files/0x000c000000024508-15.dat	family_juko
behavioral1/memory/2068-17-0x0000000000400000-0x0000000000438000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4412	WINWORD.exe
2068	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-1-5-21-876885714-46325919-1482798410-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_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

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
3564	cmd.exe
2408	PING.EXE
1532	PING.EXE
4344	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2408	PING.EXE
1532	PING.EXE
4344	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1572 wrote to memory of 4412	1572	2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe	90
PID 4412 wrote to memory of 3564	4412	WINWORD.exe	91
PID 3564 wrote to memory of 2408	3564	cmd.exe	93
PID 3564 wrote to memory of 1532	3564	cmd.exe	95
PID 3564 wrote to memory of 4344	3564	cmd.exe	97
PID 3564 wrote to memory of 2068	3564	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-15_e72b752a76d6364e4a7f95560f2b6ad4_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1572
- 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:4412
- - 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\00005D09" 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:3564
  - - 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:2408
  - - 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:1532
  - - 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:4344
  - - 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:2068

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

00005D09

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005D09
Size 222KB
SHA256 c5efc8749ce9ca84ce9f8ccdf13936d3abca4c4c9e199b52ae52111f0b266543
MD5 3fc1d79864f9919c656e8e24dfa0dfd2
SHA1 65a7a8e5667ae91904dc99c2e9bd350068f14a8b
SHA512 725d636cdfd4c56eae9fd01c2e29d3dbf8006806ed08caa5deff1d60dc53cf00e271cc2d5ecbf101f739b72f76e790b34d714976ce05b1994fd590541bb3f399
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokY:WkwcERoA28wzmJje7RsHcUTY
TLSH
T179245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 222KB
SHA256 32756d41601377b59afaa3f6075c2a9fbd42b212935a69912570d6d0ab66b8d0
MD5 e72b752a76d6364e4a7f95560f2b6ad4
SHA1 81dd8b2e1c20cba76542973914048a92b1bc3bc3
SHA512 709521cf6af9c7d276419e7a5c05cbddfa269cdade5362639d1124c5fd707c6202059c34844bfd9805cc64bbda35f03c9d7a405df5e7b2434afa18f332c6862b
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokY:WkwcERoA28wzmJje7RsHcUTY
TLSH
T187245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1572-0-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/1572-12-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/2068-17-0x0000000000400000-0x0000000000438000-memory.dmp

Download

memory/4412-14-0x0000000000400000-0x0000000000438000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads