juko | 21899d4df78c7aa1bc2d6e2731f029c1e149bb6da873b5147d33302dbb73aec0

General

Target
2026-05-06_e00a9676f4a44fae1c643bc8c916e536_elex_wannacry.exe
Size 53KB
Sample260506-papsashx6v
SHA256 21899d4df78c7aa1bc2d6e2731f029c1e149bb6da873b5147d33302dbb73aec0
MD5 e00a9676f4a44fae1c643bc8c916e536
SHA1 225e050b62635bfc76388ba5bff6192decae47e6
SHA512 db9f9bc05264d523d6e58d62013c2e8c7478d457fc95af19a1580d13ee3ed724030febd14b51ecd5856e0adeecd1d05ecc3c9fb76a1235630d1b102ff88534db
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2C:3Ly2Kerc64CiGIm1tcBMUOOFC
TLSH
T1B1335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000700000001e423-4.dat	family_juko
behavioral1/files/0x000a0000000242c2-12.dat	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	2026-05-06_e00a9676f4a44fae1c643bc8c916e536_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-745935970-1373868228-562466063-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1048	WINWORD.exe
2600	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-06_e00a9676f4a44fae1c643bc8c916e536_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
1096	cmd.exe
2468	PING.EXE
1604	PING.EXE
3796	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2468	PING.EXE
1604	PING.EXE
3796	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3700 wrote to memory of 1048	3700	2026-05-06_e00a9676f4a44fae1c643bc8c916e536_elex_wannacry.exe	86
PID 1048 wrote to memory of 1096	1048	WINWORD.exe	87
PID 1096 wrote to memory of 2468	1096	cmd.exe	89
PID 1096 wrote to memory of 1604	1096	cmd.exe	90
PID 1096 wrote to memory of 3796	1096	cmd.exe	91
PID 1096 wrote to memory of 2600	1096	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-05-06_e00a9676f4a44fae1c643bc8c916e536_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-06_e00a9676f4a44fae1c643bc8c916e536_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3700
- 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:1048
- - 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\000003FD" 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:1096
  - - 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:2468
  - - 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:1604
  - - 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:3796
  - - 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:2600

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

000003FD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000003FD
Size 53KB
SHA256 1b2f249b2be37c7fabe750460282957a2135f2c32bbf5607bc54734da1f15c77
MD5 ac7ccd516144cb88e3f98d72a35cfc21
SHA1 47a45f8c785e4a37b68a292d95be2a3084a3f15a
SHA512 d6d93a209ed55b78cf9551a864c1bae98b035021386d9288db852b33d89df0fb7f331e963273fed7582d824bb5247776d2d03537f86a9d70c2d012923224116d
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2k:3Ly2Kerc64CiGIm1tcBMUOOFk
TLSH
T1BD335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 21899d4df78c7aa1bc2d6e2731f029c1e149bb6da873b5147d33302dbb73aec0
MD5 e00a9676f4a44fae1c643bc8c916e536
SHA1 225e050b62635bfc76388ba5bff6192decae47e6
SHA512 db9f9bc05264d523d6e58d62013c2e8c7478d457fc95af19a1580d13ee3ed724030febd14b51ecd5856e0adeecd1d05ecc3c9fb76a1235630d1b102ff88534db
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2C:3Ly2Kerc64CiGIm1tcBMUOOFC
TLSH
T1B1335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads