juko | d309a8b58a515249129a1131aaf2434a96f8e5d33a6b793588b5d604a730ece9

General

Target
2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe
Size 64KB
Sample260505-ynhetaaz3l
SHA256 d309a8b58a515249129a1131aaf2434a96f8e5d33a6b793588b5d604a730ece9
MD5 ca4070a84b4e26a2f0920247a520eff1
SHA1 0e990e5c85e64de1c36a59e9c01b0dfa416956d0
SHA512 5564d3ecf5d8fc9cd7471ed305f4ae9800fd5f357120e3aaee4f64dd53b584dbea8954b26f43ff00799b178d2b8174db01b2529d90e3ff44ce947cb0b5189954
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1A7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x0006000000021714-4.dat	family_juko
behavioral1/files/0x000a000000024242-12.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-1-5-21-636600838-1632888396-3521553955-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-636600838-1632888396-3521553955-1000\Control Panel\International\Geo\Nation	2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3636	WINWORD.exe
4324	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-1-5-21-636600838-1632888396-3521553955-1000\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_ca4070a84b4e26a2f0920247a520eff1_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
396	PING.EXE
3804	PING.EXE
1168	PING.EXE
5472	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
396	PING.EXE
3804	PING.EXE
1168	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3920 wrote to memory of 3636	3920	2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe	84
PID 3636 wrote to memory of 5472	3636	WINWORD.exe	85
PID 5472 wrote to memory of 396	5472	cmd.exe	87
PID 5472 wrote to memory of 3804	5472	cmd.exe	88
PID 5472 wrote to memory of 1168	5472	cmd.exe	89
PID 5472 wrote to memory of 4324	5472	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3920
- 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:3636
- - 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\000006BD" 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:5472
  - - 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:396
  - - 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:3804
  - - 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:1168
  - - 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:4324

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

000006BD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000006BD
Size 64KB
SHA256 9759a069fd70faf1889e27f0bfcf76d3206c433e7a5921eaf3aba983edc54acd
MD5 ff7b4c378b79ab22813845f0a0c1c3b5
SHA1 ac09ec8f743f27080d59e517a80ba197b9fa93e7
SHA512 3ff8549fdcd784602b6fbff4a61fb423740375af2343e80554ba39d3cd0ebbdea6243be90fb06d6ad0cf1529c99fa36aa0121f74926f360c1dad5c19d8c8146c
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ud:sLy2Kerc64CiGIm8so28d
TLSH
T1EA536C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 d309a8b58a515249129a1131aaf2434a96f8e5d33a6b793588b5d604a730ece9
MD5 ca4070a84b4e26a2f0920247a520eff1
SHA1 0e990e5c85e64de1c36a59e9c01b0dfa416956d0
SHA512 5564d3ecf5d8fc9cd7471ed305f4ae9800fd5f357120e3aaee4f64dd53b584dbea8954b26f43ff00799b178d2b8174db01b2529d90e3ff44ce947cb0b5189954
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1A7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads