juko | 5cf2e3ab6e80beaef1e414c1edabbe22cb797ca29b689eb4d6bdd92727c4d0e4

General

Target
2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe
Size 70KB
Sample261017-rcpanafc69
SHA256 5cf2e3ab6e80beaef1e414c1edabbe22cb797ca29b689eb4d6bdd92727c4d0e4
MD5 79ea29e6b261a08677469b63d131f8b0
SHA1 8907b05c1e07ae57860fb5f02470a4785dbe5fab
SHA512 d552218c9b94ebeb2aaa67bc8c30df5bba212ef034280d5a4260263d135896730883428134943d8cb00fb10038d6c2af1366969a88e0cce910a28839f14848d6
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOk:vLy2Kerc64CiGImVuX/N81rRLoD51YOk
TLSH
T17A633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 6 IoCs

resource	yara_rule
behavioral1/memory/2276-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x000300000002146a-4.dat	family_juko
behavioral1/memory/2276-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/memory/4512-14-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral1/files/0x000400000001e6f2-15.dat	family_juko
behavioral1/memory/2100-18-0x0000000000400000-0x000000000041C000-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-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-240542094-4193773837-3211495583-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4512	WINWORD.exe
2100	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-1-5-21-240542094-4193773837-3211495583-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3988	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.exe

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	2026-10-16_79ea29e6b261a08677469b63d131f8b0_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
3988	cmd.exe
3448	PING.EXE
3888	PING.EXE
2724	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3448	PING.EXE
3888	PING.EXE
2724	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2276 wrote to memory of 4512	2276	2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe	88
PID 4512 wrote to memory of 3988	4512	WINWORD.exe	89
PID 3988 wrote to memory of 3448	3988	cmd.exe	91
PID 3988 wrote to memory of 3888	3988	cmd.exe	92
PID 3988 wrote to memory of 2724	3988	cmd.exe	95
PID 3988 wrote to memory of 2100	3988	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-16_79ea29e6b261a08677469b63d131f8b0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2276
- 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:4512
- - 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\00000164" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3988
  - - 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:3448
  - - 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:3888
  - - 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:2724
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:2100

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00000164

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000164
Size 70KB
SHA256 ae55b6aa298541542b2128eb36075d3c02e2e0c06be1439cfd44449c7113abfa
MD5 5fbbb332bdb92a3ab06f1d1e7eddb378
SHA1 86e18103a0ad31bfffeec432d52c41d22af3188f
SHA512 263eaf606f015929ba9e2b3dca96e2da887ee44303b5fcca1bcee45b3789dace4fcbc6f833b0af0419a10f0019528f04edeeeb0d80f5b871c82d0570677971ee
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYO1:vLy2Kerc64CiGImVuX/N81rRLoD51YO1
TLSH
T163633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 70KB
SHA256 5cf2e3ab6e80beaef1e414c1edabbe22cb797ca29b689eb4d6bdd92727c4d0e4
MD5 79ea29e6b261a08677469b63d131f8b0
SHA1 8907b05c1e07ae57860fb5f02470a4785dbe5fab
SHA512 d552218c9b94ebeb2aaa67bc8c30df5bba212ef034280d5a4260263d135896730883428134943d8cb00fb10038d6c2af1366969a88e0cce910a28839f14848d6
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOk:vLy2Kerc64CiGImVuX/N81rRLoD51YOk
TLSH
T17A633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2100-18-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/2276-0-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/2276-12-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4512-14-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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