juko | d0ce31a34b980dfcf8d026690b9746e779b8688ff75d1af6bd3d55d986334ec0

General

Target
2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe
Size 88KB
Sample260505-nmjldad16w
SHA256 d0ce31a34b980dfcf8d026690b9746e779b8688ff75d1af6bd3d55d986334ec0
MD5 aaf02a8eb68c425f90fb61cda9a09a95
SHA1 4731c3c5a2052cc156ee944d39ef76812fb56e19
SHA512 95e517cc2479273aea66fe07e5050e7b536f659def688c37f9755679a639a5f1010907bdd3166ae3a402f538e297b9ba7e08270634c3147b4bb76051f844780e
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs1:zLy2Kerc64CiGImHc/28wzCBlycJWeey
TLSH
T141933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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 8 IoCs

resource	yara_rule
behavioral1/memory/4324-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000a00000002166e-5.dat	family_juko
behavioral1/memory/3592-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4324-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/3592-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x0014000000024416-16.dat	family_juko
behavioral1/memory/5248-18-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/5248-19-0x0000000000400000-0x000000000042A000-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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3592	WINWORD.exe
5248	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-1-5-21-914486190-3969805341-592249730-1000\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	2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_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
2340	cmd.exe
3856	PING.EXE
2372	PING.EXE
5292	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3856	PING.EXE
2372	PING.EXE
5292	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4324 wrote to memory of 3592	4324	2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe	90
PID 3592 wrote to memory of 2340	3592	WINWORD.exe	91
PID 2340 wrote to memory of 3856	2340	cmd.exe	93
PID 2340 wrote to memory of 2372	2340	cmd.exe	94
PID 2340 wrote to memory of 5292	2340	cmd.exe	95
PID 2340 wrote to memory of 5248	2340	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4324
- 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:3592
- - 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\000068F3" 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:2340
  - - 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:3856
  - - 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:2372
  - - 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:5292
  - - 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:5248

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

Replay Monitor

Loading Replay Monitor...

Downloads

000068F3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000068F3
Size 88KB
SHA256 a01dbf2ddd45e62e9125288862e3d258eb5d6f974e5fe4d93124c9ba16dbafa6
MD5 6e0f217280a26f26b723f6e1305d1a62
SHA1 8f2af9ce0b9b36f3da4c4debe6dfc104188f6f8c
SHA512 4c6976260a2c0d9194c5d63d9d503c7a1790f440f6ad47716831ce090d9cddb6b4c646c6dc20fee92618a7f31d8109c7b753f1c3c044f60043e605926a4e4231
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsw:zLy2Kerc64CiGImHc/28wzCBlycJWee3
TLSH
T10B933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 d0ce31a34b980dfcf8d026690b9746e779b8688ff75d1af6bd3d55d986334ec0
MD5 aaf02a8eb68c425f90fb61cda9a09a95
SHA1 4731c3c5a2052cc156ee944d39ef76812fb56e19
SHA512 95e517cc2479273aea66fe07e5050e7b536f659def688c37f9755679a639a5f1010907bdd3166ae3a402f538e297b9ba7e08270634c3147b4bb76051f844780e
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs1:zLy2Kerc64CiGImHc/28wzCBlycJWeey
TLSH
T141933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3592-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3592-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4324-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4324-13-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5248-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5248-19-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads