juko | 244a5c0b4c96502220e824e71a89dd29c590300ee20372f0dbc8228922275dd1

General

Target
2026-10-19_809115638f8687eae95513c7616aba75_elex_wannacry.exe
Size 49KB
Sample261020-sfljlsbs4t
SHA256 244a5c0b4c96502220e824e71a89dd29c590300ee20372f0dbc8228922275dd1
MD5 809115638f8687eae95513c7616aba75
SHA1 700fb171e916a03f155a3e32fa9245a9a5a542ef
SHA512 01716dbd73700bd371df59bfc46884bd850a4df0571fb2819c49a17b776338cb5c2506e0b5b10cfce850f6108aab5779a231aec29b51179529a38d9c4551031f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2v:VLy2Kerc64CiGImVu8p4kojWh2v
TLSH
T1E2334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/3444-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000004e8-4.dat	family_juko
behavioral1/memory/3812-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3444-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3812-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000c000000021467-16.dat	family_juko
behavioral1/memory/3380-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3380-20-0x0000000000400000-0x0000000000420000-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-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	2026-10-19_809115638f8687eae95513c7616aba75_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3812	WINWORD.exe
3380	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-1-5-21-895009113-1202185046-1686627690-1000\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
2408	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-19_809115638f8687eae95513c7616aba75_elex_wannacry.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
2408	cmd.exe
4420	PING.EXE
5108	PING.EXE
5056	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4420	PING.EXE
5108	PING.EXE
5056	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3444 wrote to memory of 3812	3444	2026-10-19_809115638f8687eae95513c7616aba75_elex_wannacry.exe	87
PID 3812 wrote to memory of 2408	3812	WINWORD.exe	88
PID 2408 wrote to memory of 4420	2408	cmd.exe	90
PID 2408 wrote to memory of 5108	2408	cmd.exe	93
PID 2408 wrote to memory of 5056	2408	cmd.exe	96
PID 2408 wrote to memory of 3380	2408	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\2026-10-19_809115638f8687eae95513c7616aba75_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_809115638f8687eae95513c7616aba75_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3444
- 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:3812
- - 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\00004B61" 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:2408
  - - 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:4420
  - - 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:5108
  - - 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:5056
  - - 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:3380

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

00004B61

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004B61
Size 49KB
SHA256 d467bd24ed4b85da6d776a35c21f651ae7225079ba2dc2a743ac82f317818383
MD5 b5ab406f1c11f38b7fbc4466e3ad0111
SHA1 c631aca01edb745d0e5fc3d276f33d91ccdf4a95
SHA512 c9afc4c3f8d5bba18ada0fce7e9466ba99593f85d7ed2c34b4c37b5516da54a24d0cb29815c040a30b8c7fe0c48716b3ae29d7bac00295c8ae4648df88664239
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h25:VLy2Kerc64CiGImVu8p4kojWh25
TLSH
T1FB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 244a5c0b4c96502220e824e71a89dd29c590300ee20372f0dbc8228922275dd1
MD5 809115638f8687eae95513c7616aba75
SHA1 700fb171e916a03f155a3e32fa9245a9a5a542ef
SHA512 01716dbd73700bd371df59bfc46884bd850a4df0571fb2819c49a17b776338cb5c2506e0b5b10cfce850f6108aab5779a231aec29b51179529a38d9c4551031f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2v:VLy2Kerc64CiGImVu8p4kojWh2v
TLSH
T1E2334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3380-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3380-20-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3444-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3444-13-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3812-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3812-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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