juko | 56bc7b2aa66ead41e0fe93c3f9c060bd9665aed8ba489a854967a562d6d2da1a

General

Target
2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe
Size 49KB
Sample260727-qh99mstses
SHA256 56bc7b2aa66ead41e0fe93c3f9c060bd9665aed8ba489a854967a562d6d2da1a
MD5 4d2b147ee611a31bf36e9ceafba79a68
SHA1 55e84724446730481cc62a4fa660f2acc17753d3
SHA512 009e093c737b763f6222e505ab503da3ad720faf62104b16648cf64877f078f9d99d349907fd6ee5969200b5c7fed31e33086c29b92fbd31f5ddbf7eda113cd3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2R:VLy2Kerc64CiGImVucp4kojWh2R
TLSH
T19C334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA740765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral1/memory/5028-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b000000024388-5.dat	family_juko
behavioral1/memory/5028-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1376-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024480-15.dat	family_juko
behavioral1/memory/4872-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4872-18-0x0000000000400000-0x0000000000420000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1376	WINWORD.exe
4872	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-1-5-21-668679576-120646659-2289335452-1000\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
1980	cmd.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	2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_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
1868	PING.EXE
716	PING.EXE
1980	cmd.exe
3544	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3544	PING.EXE
1868	PING.EXE
716	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5028 wrote to memory of 1376	5028	2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe	85
PID 1376 wrote to memory of 1980	1376	WINWORD.exe	86
PID 1980 wrote to memory of 3544	1980	cmd.exe	88
PID 1980 wrote to memory of 1868	1980	cmd.exe	89
PID 1980 wrote to memory of 716	1980	cmd.exe	90
PID 1980 wrote to memory of 4872	1980	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5028
- 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:1376
- - 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\00004646" 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:1980
  - - 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:3544
  - - 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:1868
  - - 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:716
  - - 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:4872

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00004646

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004646
Size 49KB
SHA256 cce08aa6045cce19cbe54fb8890e0e5d5d76e4fcc5429b3661ed4829ab105d8f
MD5 cf516d315beedba14c0e1fe41574c40f
SHA1 cf3789387f15f77d6ab7420f481c93d64c418b54
SHA512 c1425c8bd9a53f040d4b4bc1417302330cef7fdd6d6cea35d0af979f888eee92df9148682d7cd8354b087e279c8775fc9c9cf7cc0d19824f1835875e87c0a56f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2C:VLy2Kerc64CiGImVucp4kojWh2C
TLSH
T1C1334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 56bc7b2aa66ead41e0fe93c3f9c060bd9665aed8ba489a854967a562d6d2da1a
MD5 4d2b147ee611a31bf36e9ceafba79a68
SHA1 55e84724446730481cc62a4fa660f2acc17753d3
SHA512 009e093c737b763f6222e505ab503da3ad720faf62104b16648cf64877f078f9d99d349907fd6ee5969200b5c7fed31e33086c29b92fbd31f5ddbf7eda113cd3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2R:VLy2Kerc64CiGImVucp4kojWh2R
TLSH
T19C334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1376-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4872-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4872-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5028-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5028-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads