juko | df591bc0e2a757a56be5f81de466f8ef4a5bc7b78643e5ec7a1d2fba86a506f1

General

Target
2026-08-04_b68930423488d429ce7e4be79c3bc660_elex_wannacry.exe
Size 42KB
Sample260804-rtrgcacc52
SHA256 df591bc0e2a757a56be5f81de466f8ef4a5bc7b78643e5ec7a1d2fba86a506f1
MD5 b68930423488d429ce7e4be79c3bc660
SHA1 456a4079d0e69dc9093eb590a6a39e996f3c2af8
SHA512 1fb4555a85075e5fca6e1a9e04b09db5aef6f46a40f5b9b9f3880f3986ce7fb25ac40d0956888047e4f4ea461c338b4844dd968661e67c92c936bcc149edb3fa
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41Q:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+T
TLSH
T13F13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000b000000011390-4.dat	family_juko
behavioral2/files/0x0006000000016cbe-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2136	WINWORD.exe
1704	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5904	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	2026-08-04_b68930423488d429ce7e4be79c3bc660_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
5904	cmd.exe
2652	PING.EXE
5516	PING.EXE
1960	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2652	PING.EXE
5516	PING.EXE
1960	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5980 wrote to memory of 2136	5980	2026-08-04_b68930423488d429ce7e4be79c3bc660_elex_wannacry.exe	89
PID 2136 wrote to memory of 5904	2136	WINWORD.exe	90
PID 5904 wrote to memory of 2652	5904	cmd.exe	92
PID 5904 wrote to memory of 5516	5904	cmd.exe	93
PID 5904 wrote to memory of 1960	5904	cmd.exe	94
PID 5904 wrote to memory of 1704	5904	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_b68930423488d429ce7e4be79c3bc660_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_b68930423488d429ce7e4be79c3bc660_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5980
- 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:2136
- - 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\000010AA" 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:5904
  - - 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:2652
  - - 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:5516
  - - 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:1960
  - - 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:1704

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

000010AA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000010AA
Size 42KB
SHA256 aa48bdacbd4c97797b73c77ea5f34e433c131a5cff71af62b8ba3d4facfb5886
MD5 1bc089ee7dc92ed2ad8516c3413c2962
SHA1 1e861a2e5f76f1f1898c364a5632a44839442388
SHA512 6b755b601e5becfbe9e846b2c8d69275bf7e2741a8746eec33a014af19ddf0a36126fe10104b0e101a593f06a3bf7d634e2c8019abc28f419c0ba94962bce61f
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41m:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+B
TLSH
T11F13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 df591bc0e2a757a56be5f81de466f8ef4a5bc7b78643e5ec7a1d2fba86a506f1
MD5 b68930423488d429ce7e4be79c3bc660
SHA1 456a4079d0e69dc9093eb590a6a39e996f3c2af8
SHA512 1fb4555a85075e5fca6e1a9e04b09db5aef6f46a40f5b9b9f3880f3986ce7fb25ac40d0956888047e4f4ea461c338b4844dd968661e67c92c936bcc149edb3fa
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41Q:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+T
TLSH
T13F13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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