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
behavioral2/memory/1424-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x00170000000115c4-5.dat	family_juko
behavioral2/memory/1424-9-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/1284-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000f00000001b856-13.dat	family_juko
behavioral2/memory/3888-15-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/3888-16-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1284	WINWORD.exe
3888	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-1-5-21-2639994890-966400312-4246138405-1000\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	2026-07-03_1bb20eea07e31618e83465a3f8f159cd_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
2108	cmd.exe
1712	PING.EXE
1684	PING.EXE
4856	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1712	PING.EXE
1684	PING.EXE
4856	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1424 wrote to memory of 1284	1424	2026-07-03_1bb20eea07e31618e83465a3f8f159cd_elex_wannacry.exe	88
PID 1284 wrote to memory of 2108	1284	WINWORD.exe	89
PID 2108 wrote to memory of 1712	2108	cmd.exe	91
PID 2108 wrote to memory of 1684	2108	cmd.exe	92
PID 2108 wrote to memory of 4856	2108	cmd.exe	93
PID 2108 wrote to memory of 3888	2108	cmd.exe	94

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1424
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1284
- - 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\000001DF" 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:2108
  - - 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:1712
  - - 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:1684
  - - 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:4856
  - - 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:3888

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

000001DF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000001DF
Size 57KB
SHA256 7dd424ee55ca4c544753ab929bec76ff8d02f264f554e91e5f48d8ab6ff91e01
MD5 d57cb63b6e618728ef28e2562e79c793
SHA1 a5d9055a1f0e8f67935eaa4ba76fdf1e4b17baa2
SHA512 72b2198aa7386e6b12f55675f2dcbff50711a7da54113b49a87471aede5aa871eeffc8f614c92b363ce01d9621536e416a4cc75179d36262205b92586f476b67
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqar:wLy2Kerc64CiGImEsoDfar
TLSH
T15D433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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/1284-12-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/1424-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/1424-9-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/3888-15-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/3888-16-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads