juko | d3709130e4305f547b6d0070e493764c1d9911b799b113bfa0912c0418417dfd

General

Target
2026-07-03_1bb20eea07e31618e83465a3f8f159cd_elex_wannacry.exe
Size 57KB
Sample260703-x5a7dsfs21
SHA256 d3709130e4305f547b6d0070e493764c1d9911b799b113bfa0912c0418417dfd
MD5 1bb20eea07e31618e83465a3f8f159cd
SHA1 c440b12479190c1f629ae60ecb1935873635363d
SHA512 a74cca2ef850d409e6491b8441ba3f7721dc76b6f5afc267bb1baf97b2678fcad06e8521fd25c69e43f218a7faf15a71bdfc8fdb4b984cf22dbc5103583eef03
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaZ:wLy2Kerc64CiGImEsoDfaZ
TLSH
T142433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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/4836-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x000b0000000243e0-5.dat	family_juko
behavioral1/memory/4836-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/3040-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x00090000000244ad-15.dat	family_juko
behavioral1/memory/4596-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/4596-18-0x0000000000400000-0x000000000041F000-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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-07-03_1bb20eea07e31618e83465a3f8f159cd_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3040	WINWORD.exe
4596	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-1-5-21-540052884-2969440504-464782435-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-03_1bb20eea07e31618e83465a3f8f159cd_elex_wannacry.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
1612	cmd.exe
3256	PING.EXE
2172	PING.EXE
2664	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3256	PING.EXE
2172	PING.EXE
2664	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 3040	4836	2026-07-03_1bb20eea07e31618e83465a3f8f159cd_elex_wannacry.exe	83
PID 3040 wrote to memory of 1612	3040	WINWORD.exe	84
PID 1612 wrote to memory of 3256	1612	cmd.exe	86
PID 1612 wrote to memory of 2172	1612	cmd.exe	87
PID 1612 wrote to memory of 2664	1612	cmd.exe	88
PID 1612 wrote to memory of 4596	1612	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-07-03_1bb20eea07e31618e83465a3f8f159cd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-03_1bb20eea07e31618e83465a3f8f159cd_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4836
- 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:3040
- - 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\00002A68" 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:1612
  - - 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:3256
  - - 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:2172
  - - 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:2664
  - - 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:4596

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

00002A68

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002A68
Size 57KB
SHA256 23207a355bec5e9e71e7fff85984c534c95c1b77d5313f7ac63e55771c8e6319
MD5 8b1a342ee13de2ad294d92801e66c6e2
SHA1 f82262afa600751be6b4454c073003ca80126480
SHA512 060c83fe312f28e60cc9e1cdcf7de3e8b020fde91434dfbb3ee027c85decd396aa558bd158b868e1567311d982ca9293c0d44ca5f27a1926e580943e3decf444
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa1:wLy2Kerc64CiGImEsoDfa1
TLSH
T1CD433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 d3709130e4305f547b6d0070e493764c1d9911b799b113bfa0912c0418417dfd
MD5 1bb20eea07e31618e83465a3f8f159cd
SHA1 c440b12479190c1f629ae60ecb1935873635363d
SHA512 a74cca2ef850d409e6491b8441ba3f7721dc76b6f5afc267bb1baf97b2678fcad06e8521fd25c69e43f218a7faf15a71bdfc8fdb4b984cf22dbc5103583eef03
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaZ:wLy2Kerc64CiGImEsoDfaZ
TLSH
T142433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3040-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4596-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4596-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4836-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4836-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads