juko | bb0d7e017af47e73df7b6ee91df8a745c190e44c502496b68e02e3aafc6dd791

General

Target
2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe
Size 49KB
Sample260809-ep5ryszekf
SHA256 bb0d7e017af47e73df7b6ee91df8a745c190e44c502496b68e02e3aafc6dd791
MD5 70cede138c89a7a59c0193e23bc8c1ed
SHA1 714851d5219724013f9f35d4a847fc5e04bab058
SHA512 f650dbecfa7c738f2aa23b895a268618495dfb927fdc6245b38abf4c8854c87a80524577c6f1415a22dbce92c10615e7e20e1ac88dbcf660347aae421558bc6c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2F:4Ly2Kerc64CiGImVu8p4kojWh2F
TLSH
T171334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4640-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000800000002420b-5.dat	family_juko
behavioral1/memory/4640-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4880-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000800000002420c-15.dat	family_juko
behavioral1/memory/5040-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5040-18-0x0000000000400000-0x0000000000420000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4880	WINWORD.exe
5040	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-1-5-21-889581200-2041691093-2048517887-1000\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
620	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_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

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
620	cmd.exe
3696	PING.EXE
3852	PING.EXE
4008	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3696	PING.EXE
3852	PING.EXE
4008	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4640 wrote to memory of 4880	4640	2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe	85
PID 4880 wrote to memory of 620	4880	WINWORD.exe	86
PID 620 wrote to memory of 3696	620	cmd.exe	88
PID 620 wrote to memory of 3852	620	cmd.exe	89
PID 620 wrote to memory of 4008	620	cmd.exe	90
PID 620 wrote to memory of 5040	620	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4640
- 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:4880
- - 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\000016D5" 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:620
  - - 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:3696
  - - 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:3852
  - - 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:4008
  - - 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:5040

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

000016D5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000016D5
Size 49KB
SHA256 bc4892680064eda0c6e7f6743bc0a1ccb07ec7d81714c76533cde6afa62d8383
MD5 af8df5ade3e1740e1cc34254501b57b8
SHA1 7b7b2244fef4645f5d5c95aa622872e0d4516022
SHA512 68c4c967e5867ce704518071ab9b984dfceac430d9f9afab3d0677634749356ead0790c337109ae9a16abab773310632eca52ef1cad781c74449db379c5ef7a9
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2r:4Ly2Kerc64CiGImVu8p4kojWh2r
TLSH
T167334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 bb0d7e017af47e73df7b6ee91df8a745c190e44c502496b68e02e3aafc6dd791
MD5 70cede138c89a7a59c0193e23bc8c1ed
SHA1 714851d5219724013f9f35d4a847fc5e04bab058
SHA512 f650dbecfa7c738f2aa23b895a268618495dfb927fdc6245b38abf4c8854c87a80524577c6f1415a22dbce92c10615e7e20e1ac88dbcf660347aae421558bc6c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2F:4Ly2Kerc64CiGImVu8p4kojWh2F
TLSH
T171334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4640-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4640-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4880-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5040-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5040-18-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads