juko | 521e4d14e136b1953f828df82db08d425cde0a985893175cb724483897f6a3ee

General

Target
2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_elex_wannacry.exe
Size 88KB
Sample260818-wfvdaser7t
SHA256 521e4d14e136b1953f828df82db08d425cde0a985893175cb724483897f6a3ee
MD5 5c4c174d9989c91ccfd76adcdfb711c4
SHA1 756625c9226243f301ed3df05cca72421e5f7945
SHA512 2060ff4c2665219342324f45165b22eafac6e6eecd51b654d4bbcd5a6328aa489c5273e34304bd0220e1c8612c91be25b31c794c1c2159f06ff21b80cdb295ab
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs5:zLy2Kerc64CiGImHc/28wzCBlycJWeeC
TLSH
T1B6933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/2180-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000c0000000243a5-5.dat	family_juko
behavioral1/memory/2180-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/5096-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000300000001e6de-15.dat	family_juko
behavioral1/memory/2412-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/2412-18-0x0000000000400000-0x000000000042A000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5096	WINWORD.exe
2412	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-1-5-21-1788976790-1541110888-1636651838-1000\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
1308	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	2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_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
2124	PING.EXE
876	PING.EXE
2164	PING.EXE
1308	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2124	PING.EXE
876	PING.EXE
2164	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2180 wrote to memory of 5096	2180	2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_elex_wannacry.exe	85
PID 5096 wrote to memory of 1308	5096	WINWORD.exe	88
PID 1308 wrote to memory of 2124	1308	cmd.exe	90
PID 1308 wrote to memory of 876	1308	cmd.exe	91
PID 1308 wrote to memory of 2164	1308	cmd.exe	93
PID 1308 wrote to memory of 2412	1308	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2180
- 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:5096
- - 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\00001A45" 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:1308
  - - 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:2124
  - - 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:876
  - - 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:2164
  - - 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:2412

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

00001A45

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001A45
Size 88KB
SHA256 be7ec50c0ef3a21cdbbf9bdb9026e53d47e474b593400202583b1c4661b1adce
MD5 84f5207474145535156fad38593d125e
SHA1 bd7f667cdd2367bcd74683c10b9cdd0e1edf70d0
SHA512 8cf1e6ba7b3556d3596ccc6ef274b60f84c09abf7748ef9caacc22d02e6b04d513d6fa572d421e21fa84a67674a1181981bb8ce7156650d7463e68b100cb6597
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs8:zLy2Kerc64CiGImHc/28wzCBlycJWeeb
TLSH
T1FE933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 521e4d14e136b1953f828df82db08d425cde0a985893175cb724483897f6a3ee
MD5 5c4c174d9989c91ccfd76adcdfb711c4
SHA1 756625c9226243f301ed3df05cca72421e5f7945
SHA512 2060ff4c2665219342324f45165b22eafac6e6eecd51b654d4bbcd5a6328aa489c5273e34304bd0220e1c8612c91be25b31c794c1c2159f06ff21b80cdb295ab
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs5:zLy2Kerc64CiGImHc/28wzCBlycJWeeC
TLSH
T1B6933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2180-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2180-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2412-17-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/2412-18-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/5096-14-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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