juko | 5fca1ec62dd379e107405140c11c2d2411476c06d2b646f7668ff06cdf452770

General

Target
2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe
Size 88KB
Sample260823-e5hblaej8w
SHA256 5fca1ec62dd379e107405140c11c2d2411476c06d2b646f7668ff06cdf452770
MD5 9696b86f404c874602bb417cfedafefe
SHA1 49ad79f1427a20cedc05f29e753b5f4815912db5
SHA512 00e3bdd68a3f01269842a60635de55f2393cca1e8363bceaa763b2d9a2dd9e1bd9802c4983d3e4ca3e73ad6cb2bff9eb3bd518de004fc0422c988d81706d928a
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsI:zLy2Kerc64CiGImHc/28wzCBlycJWee7
TLSH
T176933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/2420-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000c000000016cdf-5.dat	family_juko
behavioral2/memory/2420-9-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1184-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4e8-13.dat	family_juko
behavioral2/memory/2576-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2576-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1184	WINWORD.exe
2576	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
4176	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	2026-08-22_9696b86f404c874602bb417cfedafefe_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
1988	PING.EXE
4376	PING.EXE
4176	cmd.exe
4260	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4260	PING.EXE
1988	PING.EXE
4376	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 1184	2420	2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe	89
PID 1184 wrote to memory of 4176	1184	WINWORD.exe	90
PID 4176 wrote to memory of 4260	4176	cmd.exe	92
PID 4176 wrote to memory of 1988	4176	cmd.exe	93
PID 4176 wrote to memory of 4376	4176	cmd.exe	94
PID 4176 wrote to memory of 2576	4176	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2420
- 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:1184
- - 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\00007A93" 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:4176
  - - 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:4260
  - - 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:1988
  - - 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:4376
  - - 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:2576

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

Replay Monitor

Loading Replay Monitor...

Downloads

00007A93

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A93
Size 88KB
SHA256 87aeb800a0aeed359053c5c5b4219ae49ab8379528664e64e3ba59837b409376
MD5 6a0669e01c7f87a1fcd245c83ed21ff4
SHA1 dd679b24f66de1ef6905ee7e8c4fd86016592441
SHA512 14df312d15606ec880cd663f8669d8bb68b7329a1de3019d9108507531e01e7d3e81142552cfd530ef11e3dba1ac9079dfdec26b08eaf03803de06e6c8980be4
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsQ:zLy2Kerc64CiGImHc/28wzCBlycJWeeb
TLSH
T10D933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 5fca1ec62dd379e107405140c11c2d2411476c06d2b646f7668ff06cdf452770
MD5 9696b86f404c874602bb417cfedafefe
SHA1 49ad79f1427a20cedc05f29e753b5f4815912db5
SHA512 00e3bdd68a3f01269842a60635de55f2393cca1e8363bceaa763b2d9a2dd9e1bd9802c4983d3e4ca3e73ad6cb2bff9eb3bd518de004fc0422c988d81706d928a
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsI:zLy2Kerc64CiGImHc/28wzCBlycJWee7
TLSH
T176933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1184-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2420-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2420-9-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2576-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2576-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads