juko | ec39e45803d6811f64b75ee264008145a2044f00f3cf8774a3ca11353af1170b

General

Target
2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe
Size 87KB
Sample260517-tl7jpsex8p
SHA256 ec39e45803d6811f64b75ee264008145a2044f00f3cf8774a3ca11353af1170b
MD5 fd612b144ba2e8cac877aec5e6eaa32d
SHA1 29b717d3f60101cab387a07dad95827cfd8ae780
SHA512 8a2cf33a42ab52aa10867b6280380d6c0d973699b1870d12d15673b410a9909fd8ac0bac7684f12dee2eaa6f57cec53aba2447c67a7931f254f7674f2b16eb8f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T1B393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/1364-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000a00000002453e-5.dat	family_juko
behavioral1/memory/1364-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/6016-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000900000002464d-15.dat	family_juko
behavioral1/memory/4876-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4876-18-0x0000000000400000-0x0000000000425000-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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
6016	WINWORD.exe
4876	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-1-5-21-3053180483-1881419501-3594244048-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_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

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
5340	PING.EXE
3288	cmd.exe
5208	PING.EXE
3808	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3808	PING.EXE
5340	PING.EXE
5208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1364 wrote to memory of 6016	1364	2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe	88
PID 6016 wrote to memory of 3288	6016	WINWORD.exe	89
PID 3288 wrote to memory of 5208	3288	cmd.exe	91
PID 3288 wrote to memory of 3808	3288	cmd.exe	92
PID 3288 wrote to memory of 5340	3288	cmd.exe	93
PID 3288 wrote to memory of 4876	3288	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1364
- 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:6016
- - 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\00000DBF" 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:3288
  - - 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:5208
  - - 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:3808
  - - 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:5340
  - - 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:4876

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

00000DBF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000DBF
Size 87KB
SHA256 396e2ea2bc8e79d2029a5e64291f4ad88fe3dc910936c8f99ae359d7ffcf6ca0
MD5 40983f6f896638fdd45b27166b6b04cc
SHA1 c4abc573dc85847525a5042acaaf1a09920fefdd
SHA512 eac71b32f57ed80030a3f9512084fd83651a90f30735e3f86772973603ada9eb16fc7c443e2b90397bcf52bd2419482b5c11fa9bb4ad5650deb16387f9cfd1a9
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpj:2Ly2Kerc64CiGIm1K851YO6EQkwpj
TLSH
T17D93A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 ec39e45803d6811f64b75ee264008145a2044f00f3cf8774a3ca11353af1170b
MD5 fd612b144ba2e8cac877aec5e6eaa32d
SHA1 29b717d3f60101cab387a07dad95827cfd8ae780
SHA512 8a2cf33a42ab52aa10867b6280380d6c0d973699b1870d12d15673b410a9909fd8ac0bac7684f12dee2eaa6f57cec53aba2447c67a7931f254f7674f2b16eb8f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T1B393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1364-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1364-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4876-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4876-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6016-14-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads