juko | e757eae7d1486c3c702d569d356a2a27f0928a0de43678df269c1087dd4332ec

General

Target
2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe
Size 30KB
Sample260510-nc9ptaev6t
SHA256 e757eae7d1486c3c702d569d356a2a27f0928a0de43678df269c1087dd4332ec
MD5 a173fa45409324ae5f660bf36d5e94fb
SHA1 2895ecc7ed1451abcd21bdf467851443a7db1297
SHA512 0a0fa8f84e4311f7801e44322511ddb9e5d72c1bb61bd319474c4fccbbfec966db60b83278ede845e0323a9bbd037083d0630d8162f2c01cc239e4d8ba8056b0
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX5:tLsF2Kerc64sTiX2IV0Dzlo5
TLSH
T13CE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x0014000000024218-4.dat	family_juko
behavioral1/files/0x00080000000243df-11.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	2026-05-10_a173fa45409324ae5f660bf36d5e94fb_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
4820	WINWORD.exe
392	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-10_a173fa45409324ae5f660bf36d5e94fb_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
1824	cmd.exe
3152	PING.EXE
1584	PING.EXE
816	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3152	PING.EXE
1584	PING.EXE
816	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 680 wrote to memory of 4820	680	2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe	85
PID 4820 wrote to memory of 1824	4820	WINWORD.exe	86
PID 1824 wrote to memory of 3152	1824	cmd.exe	88
PID 1824 wrote to memory of 1584	1824	cmd.exe	89
PID 1824 wrote to memory of 816	1824	cmd.exe	90
PID 1824 wrote to memory of 392	1824	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-10_a173fa45409324ae5f660bf36d5e94fb_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:680
- 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:4820
- - 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\00004A26" 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:1824
  - - 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:3152
  - - 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:1584
  - - 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:816
  - - 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:392

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

00004A26

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004A26
Size 30KB
SHA256 5b9c38d68eec65be3f619872859a4a4d1c5b7bae9262aa17abb6e4eedd907e6a
MD5 0bcfc9cf455f4aa4fb6c6575482c907e
SHA1 8da70125c2eceea2a62c0d593b4264919aeb9ee2
SHA512 7e1344550b16ed2291e448121e1bb18b5a3e4baec0434db60a5f8938174cd78e4bc5c312389ea8c3b7030566d18685ba412c6469de2480495949209f7ff98028
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX3:tLsF2Kerc64sTiX2IV0Dzlo3
TLSH
T1CDE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 e757eae7d1486c3c702d569d356a2a27f0928a0de43678df269c1087dd4332ec
MD5 a173fa45409324ae5f660bf36d5e94fb
SHA1 2895ecc7ed1451abcd21bdf467851443a7db1297
SHA512 0a0fa8f84e4311f7801e44322511ddb9e5d72c1bb61bd319474c4fccbbfec966db60b83278ede845e0323a9bbd037083d0630d8162f2c01cc239e4d8ba8056b0
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX5:tLsF2Kerc64sTiX2IV0Dzlo5
TLSH
T13CE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/392-13-0x0000000002520000-0x000000000257F000-memory.dmp

Download

memory/680-7-0x0000000001F70000-0x0000000001FCF000-memory.dmp

Download

memory/4820-10-0x0000000002390000-0x00000000023EF000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads