juko | bf5120dd484d55e1b62682728941e8f2b9da2f61b0c56809d24df4e6e2fedbb1

General

Target
2026-08-09_ccdde54443d145f509cd0e402206206b_elex_wannacry.exe
Size 49KB
Sample260809-3rewba1tcx
SHA256 bf5120dd484d55e1b62682728941e8f2b9da2f61b0c56809d24df4e6e2fedbb1
MD5 ccdde54443d145f509cd0e402206206b
SHA1 8b3458c42d0b72badcd3d0b9c28ed8b3f18e89b8
SHA512 c8f5482aec652020cc3771f8010d2cf109af58c7715ff5d96f9a7b619cd04a2e783b920340c3490930820275c9e7a94c06b99bded42ec4ec20a2d54dac487524
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2u:4Ly2Kerc64CiGImVu8p4kojWh2u
TLSH
T189334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3696-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000c000000024323-5.dat	family_juko
behavioral1/memory/892-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3696-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/892-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000243ef-16.dat	family_juko
behavioral1/memory/1332-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1332-19-0x0000000000400000-0x0000000000420000-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-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-08-09_ccdde54443d145f509cd0e402206206b_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
892	WINWORD.exe
1332	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-1-5-21-204488895-2999877624-296153668-1000\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
2376	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	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	2026-08-09_ccdde54443d145f509cd0e402206206b_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

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
516	PING.EXE
3496	PING.EXE
4920	PING.EXE
2376	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3496	PING.EXE
4920	PING.EXE
516	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3696 wrote to memory of 892	3696	2026-08-09_ccdde54443d145f509cd0e402206206b_elex_wannacry.exe	87
PID 892 wrote to memory of 2376	892	WINWORD.exe	88
PID 2376 wrote to memory of 516	2376	cmd.exe	90
PID 2376 wrote to memory of 3496	2376	cmd.exe	91
PID 2376 wrote to memory of 4920	2376	cmd.exe	92
PID 2376 wrote to memory of 1332	2376	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-09_ccdde54443d145f509cd0e402206206b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_ccdde54443d145f509cd0e402206206b_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3696
- 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:892
- - 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\00001A11" 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:2376
  - - 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:516
  - - 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:3496
  - - 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:4920
  - - 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:1332

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

00001A11

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001A11
Size 49KB
SHA256 aeee8069330f85a4ede2d1af6a906e3feff27131a38b6828742b8cfca1708cc1
MD5 0747668ae383a59eb2059d9cac895c9e
SHA1 82f53cdd85682762fbc4a2e5768f48df07a1e4b6
SHA512 59d4e549d385ca2061d9f5441407e9c1764f1621ca5e74da79d2078c23c873be41e3a56dcb768b539a0a81b0cb10f39b13b33e4b85261c7bd35ceac383042c58
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2q:4Ly2Kerc64CiGImVu8p4kojWh2q
TLSH
T14A334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 bf5120dd484d55e1b62682728941e8f2b9da2f61b0c56809d24df4e6e2fedbb1
MD5 ccdde54443d145f509cd0e402206206b
SHA1 8b3458c42d0b72badcd3d0b9c28ed8b3f18e89b8
SHA512 c8f5482aec652020cc3771f8010d2cf109af58c7715ff5d96f9a7b619cd04a2e783b920340c3490930820275c9e7a94c06b99bded42ec4ec20a2d54dac487524
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2u:4Ly2Kerc64CiGImVu8p4kojWh2u
TLSH
T189334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/892-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/892-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1332-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1332-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3696-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3696-13-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads