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
behavioral2/memory/3448-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cb5-5.dat	family_juko
behavioral2/memory/3448-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/108-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c515-13.dat	family_juko
behavioral2/memory/5400-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/5400-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
108	WINWORD.exe
5400	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-1-5-21-2246396966-3025826688-3847171515-1000\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
4892	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	2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
2696	PING.EXE
4892	cmd.exe
1692	PING.EXE
2400	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1692	PING.EXE
2400	PING.EXE
2696	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3448 wrote to memory of 108	3448	2026-08-18_5c4c174d9989c91ccfd76adcdfb711c4_elex_wannacry.exe	90
PID 108 wrote to memory of 4892	108	WINWORD.exe	91
PID 4892 wrote to memory of 1692	4892	cmd.exe	93
PID 4892 wrote to memory of 2400	4892	cmd.exe	94
PID 4892 wrote to memory of 2696	4892	cmd.exe	95
PID 4892 wrote to memory of 5400	4892	cmd.exe	96

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3448
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:108
- - 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\0000604D" 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:4892
  - - 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:1692
  - - 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:2400
  - - 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:2696
  - - 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:5400

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

0000604D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000604D
Size 88KB
SHA256 3d04000df5ed3ee67604283830bf8b2347243876b3c9a13f27b966b8d588f74c
MD5 f1137d2e8b64fe177f019d2fc33232d2
SHA1 e1b5338a06f899532cff3b5d9e160b5a721f231e
SHA512 cf9d775c9b52a256c70a9f1db7ee75630592d49a024be1b2525674bf4574126086baf9c297e8279adb9bd392a1c1e2027228c000d836b1917ee0f1dc03c0b127
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsH:zLy2Kerc64CiGImHc/28wzCBlycJWeeQ
TLSH
T105933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/108-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3448-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3448-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5400-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5400-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads