juko | e3106c32124797c542178a05cf0ab81493246932be476f8dd468c13cbb098a4b

General

Target
2026-08-08_556ef85f775e899f49b2714f2d715f28_elex_wannacry.exe
Size 49KB
Sample260808-kveqlscm5x
SHA256 e3106c32124797c542178a05cf0ab81493246932be476f8dd468c13cbb098a4b
MD5 556ef85f775e899f49b2714f2d715f28
SHA1 47794f01372f96db55e73f7083066e3ca80633b4
SHA512 9c5709afa0339879cd31198211335ffb733df6c3b215fbe1c70fab0933d864212644a3af0e64be6c9b7a2169a0d4fa85ed45b6cf9bc1ce35160276b27e0e1746
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2z:4Ly2Kerc64CiGImVu8p4kojWh2z
TLSH
T145334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4624-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cb8-5.dat	family_juko
behavioral2/memory/4624-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3416-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c54c-13.dat	family_juko
behavioral2/memory/5100-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5100-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3416	WINWORD.exe
5100	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-1-5-21-3797332335-34111092-3597280141-1000\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
356	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	2026-08-08_556ef85f775e899f49b2714f2d715f28_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
1784	PING.EXE
2692	PING.EXE
3468	PING.EXE
356	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1784	PING.EXE
2692	PING.EXE
3468	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4624 wrote to memory of 3416	4624	2026-08-08_556ef85f775e899f49b2714f2d715f28_elex_wannacry.exe	89
PID 3416 wrote to memory of 356	3416	WINWORD.exe	90
PID 356 wrote to memory of 1784	356	cmd.exe	92
PID 356 wrote to memory of 2692	356	cmd.exe	93
PID 356 wrote to memory of 3468	356	cmd.exe	94
PID 356 wrote to memory of 5100	356	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_556ef85f775e899f49b2714f2d715f28_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_556ef85f775e899f49b2714f2d715f28_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4624
- 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:3416
- - 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\00007578" 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:356
  - - 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:1784
  - - 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:2692
  - - 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:3468
  - - 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:5100

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

00007578

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007578
Size 49KB
SHA256 de41bb94298a400a35a6a53e23f3c73884089ad5a2aeaee70aaec47ae1a4a276
MD5 24df27dc39ebd0d7ee1109cd2b3ad7f0
SHA1 d8c4155368bd5dd3630e174294bfe01927050d63
SHA512 524b71b857aad17f4812168781abab3bc36e4930096cda1d1eb8e643d3768af95ee2013b13adef33b76430b4ee6c7357c97b32674fdb94e02d07b131f6d0407f
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2Z:4Ly2Kerc64CiGImVu8p4kojWh2Z
TLSH
T19B334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 e3106c32124797c542178a05cf0ab81493246932be476f8dd468c13cbb098a4b
MD5 556ef85f775e899f49b2714f2d715f28
SHA1 47794f01372f96db55e73f7083066e3ca80633b4
SHA512 9c5709afa0339879cd31198211335ffb733df6c3b215fbe1c70fab0933d864212644a3af0e64be6c9b7a2169a0d4fa85ed45b6cf9bc1ce35160276b27e0e1746
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2z:4Ly2Kerc64CiGImVu8p4kojWh2z
TLSH
T145334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3416-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4624-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4624-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5100-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5100-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads