juko | ff0c456151c732e23b560309354c747783b0d0c0e5ae5bb7a9c6a31c711b0218

General

Target
2026-09-01_70dbfa2332ff69d9605727fbf30e875c_elex_wannacry.exe
Size 88KB
Sample260903-l2gzzseq8t
SHA256 ff0c456151c732e23b560309354c747783b0d0c0e5ae5bb7a9c6a31c711b0218
MD5 70dbfa2332ff69d9605727fbf30e875c
SHA1 f2904d50c4130e54215f6e36854de26cdc7ebfdd
SHA512 b722f515cfc1a18f2c62834d6fa892f9d9530fc6d165587275f9d49b630f27c611cc36a6f8644c45bdff795617369f821033715a2f918368b55293b60cebbb22
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsy:zLy2Kerc64CiGImHc/28wzCBlycJWeeV
TLSH
T141933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4684-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000900000001b884-5.dat	family_juko
behavioral2/memory/4684-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/5912-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001000000001c4e1-13.dat	family_juko
behavioral2/memory/3176-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3176-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5912	WINWORD.exe
3176	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-1-5-21-552508041-2681165170-3229858294-1000\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
4072	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	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	2026-09-01_70dbfa2332ff69d9605727fbf30e875c_elex_wannacry.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
124	PING.EXE
4888	PING.EXE
4072	cmd.exe
108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
108	PING.EXE
124	PING.EXE
4888	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4684 wrote to memory of 5912	4684	2026-09-01_70dbfa2332ff69d9605727fbf30e875c_elex_wannacry.exe	89
PID 5912 wrote to memory of 4072	5912	WINWORD.exe	90
PID 4072 wrote to memory of 108	4072	cmd.exe	92
PID 4072 wrote to memory of 124	4072	cmd.exe	93
PID 4072 wrote to memory of 4888	4072	cmd.exe	94
PID 4072 wrote to memory of 3176	4072	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-01_70dbfa2332ff69d9605727fbf30e875c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-01_70dbfa2332ff69d9605727fbf30e875c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4684
- 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:5912
- - 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\0000079C" 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:4072
  - - 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:108
  - - 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:124
  - - 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:4888
  - - 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:3176

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

0000079C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000079C
Size 88KB
SHA256 66c03871e4292bde1f98a7b2baa5d00c322e462efd845ad258914695879a1a9b
MD5 c6d7c0ea97b38beb3c4867ef3fc2c0ac
SHA1 e263d9e13025033c5b3f0603d53563a62efbe1bf
SHA512 9f96c4a6e8f12d9db2f015806d04ca299752ad3de0203583049a507fe8155d852a9b7cf7245b1439aac49f35abe5eaa8a6cc67326d802b086eec440dc7f5d0bd
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs7:zLy2Kerc64CiGImHc/28wzCBlycJWeec
TLSH
T1CD933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 ff0c456151c732e23b560309354c747783b0d0c0e5ae5bb7a9c6a31c711b0218
MD5 70dbfa2332ff69d9605727fbf30e875c
SHA1 f2904d50c4130e54215f6e36854de26cdc7ebfdd
SHA512 b722f515cfc1a18f2c62834d6fa892f9d9530fc6d165587275f9d49b630f27c611cc36a6f8644c45bdff795617369f821033715a2f918368b55293b60cebbb22
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsy:zLy2Kerc64CiGImHc/28wzCBlycJWeeV
TLSH
T141933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3176-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3176-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4684-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4684-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5912-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads