juko | 0e1d7acbd0da3741f0df02109c3f68e41773f8797c4af656e715453895374806

General

Target
2026-08-03_59ffc7e1b07f42d801841723917991f6_elex_wannacry.exe
Size 49KB
Sample260803-k74khashkc
SHA256 0e1d7acbd0da3741f0df02109c3f68e41773f8797c4af656e715453895374806
MD5 59ffc7e1b07f42d801841723917991f6
SHA1 95ad7b8966f3e9f0ab3ab92071fcaec36f8154b8
SHA512 2d8147620754cea245c8dde1f11a1dc4240cd18f0a07af9d0a5cfdd97c20f058fb2b9d43a95378182049bc0229a6063dd4eff34aa7ae544acb6c1312d177953c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2i:VLy2Kerc64CiGImVu8p4kojWh2i
TLSH
T1D4334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2600-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000016cdf-5.dat	family_juko
behavioral2/memory/2600-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4892-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c517-13.dat	family_juko
behavioral2/memory/4572-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4572-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4892	WINWORD.exe
4572	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
1728	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	2026-08-03_59ffc7e1b07f42d801841723917991f6_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
1728	cmd.exe
5700	PING.EXE
4896	PING.EXE
4916	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5700	PING.EXE
4896	PING.EXE
4916	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2600 wrote to memory of 4892	2600	2026-08-03_59ffc7e1b07f42d801841723917991f6_elex_wannacry.exe	89
PID 4892 wrote to memory of 1728	4892	WINWORD.exe	90
PID 1728 wrote to memory of 5700	1728	cmd.exe	92
PID 1728 wrote to memory of 4896	1728	cmd.exe	93
PID 1728 wrote to memory of 4916	1728	cmd.exe	94
PID 1728 wrote to memory of 4572	1728	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_59ffc7e1b07f42d801841723917991f6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_59ffc7e1b07f42d801841723917991f6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2600
- 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:4892
- - 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\00006440" 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:1728
  - - 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:5700
  - - 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:4896
  - - 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:4916
  - - 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:4572

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

00006440

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006440
Size 49KB
SHA256 99e964c8b5378abbe482dc835708e5ea4cedcfa3694fbaf56e7ca77e5a53f39c
MD5 56d7741cbf7df47c925abf0fcbf5ad59
SHA1 ed7a8ec605d95610aa17f5d6171c428fcf84ec49
SHA512 9973b146e895309a257c3a239faa7d8ea3858780856df9ea16f5cae210ef9b13d2c7c23323f64fb04348f22297ea9bc7632acbb23eed08bf882cee3b598b574a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2i:VLy2Kerc64CiGImVu8p4kojWh2i
TLSH
T1BB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 0e1d7acbd0da3741f0df02109c3f68e41773f8797c4af656e715453895374806
MD5 59ffc7e1b07f42d801841723917991f6
SHA1 95ad7b8966f3e9f0ab3ab92071fcaec36f8154b8
SHA512 2d8147620754cea245c8dde1f11a1dc4240cd18f0a07af9d0a5cfdd97c20f058fb2b9d43a95378182049bc0229a6063dd4eff34aa7ae544acb6c1312d177953c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2i:VLy2Kerc64CiGImVu8p4kojWh2i
TLSH
T1D4334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2600-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2600-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4572-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4572-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4892-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads