juko | 1d63b275919f4280f1def6a9537dd42589b26b014b11dffac66888abd46e0e47

General

Target
2026-08-11_bc9a841f82370c78798b04bc45f6fa2e_elex_wannacry.exe
Size 49KB
Sample260811-flzbfa11gs
SHA256 1d63b275919f4280f1def6a9537dd42589b26b014b11dffac66888abd46e0e47
MD5 bc9a841f82370c78798b04bc45f6fa2e
SHA1 3ea137a325305a3b98024201f0a6d24959c0334c
SHA512 0c005d11a5dedcaea05a83019b442a4f27cc3f740a12caa380fbfe5e77d54ccb93e89ffecc437235f25f36cbc9a3c8899abf326504439b0a67c75a1a5cc6fee3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2v:VLy2Kerc64CiGImVu8p4kojWh2v
TLSH
T186334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/1136-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/1136-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4860-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cbe-13.dat	family_juko
behavioral2/memory/3648-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3648-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4860	WINWORD.exe
3648	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
4220	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	2026-08-11_bc9a841f82370c78798b04bc45f6fa2e_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
1412	PING.EXE
2672	PING.EXE
4220	cmd.exe
3548	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3548	PING.EXE
1412	PING.EXE
2672	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1136 wrote to memory of 4860	1136	2026-08-11_bc9a841f82370c78798b04bc45f6fa2e_elex_wannacry.exe	89
PID 4860 wrote to memory of 4220	4860	WINWORD.exe	90
PID 4220 wrote to memory of 3548	4220	cmd.exe	92
PID 4220 wrote to memory of 1412	4220	cmd.exe	93
PID 4220 wrote to memory of 2672	4220	cmd.exe	94
PID 4220 wrote to memory of 3648	4220	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-11_bc9a841f82370c78798b04bc45f6fa2e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-11_bc9a841f82370c78798b04bc45f6fa2e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1136
- 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:4860
- - 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\000049A0" 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:4220
  - - 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:3548
  - - 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:1412
  - - 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:2672
  - - 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:3648

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

000049A0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000049A0
Size 49KB
SHA256 7b11ba573b5d44b7d25e669e615aeddddd17343049b7cda0eb1f89685c5e1bcb
MD5 75870ca368b3eb96d00d60cc633f94c6
SHA1 3e31a35831db9d95d53000e0b84c31a721d5f214
SHA512 9c6791925294675b78ed1ac83281fc053d154d8e2e36f44918804cb54b045dd4227f94e8b60a31dffce7d8cf5e161b3e2cb2e9903e673cc77ba2462fc7a7f807
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2b:VLy2Kerc64CiGImVu8p4kojWh2b
TLSH
T105334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 1d63b275919f4280f1def6a9537dd42589b26b014b11dffac66888abd46e0e47
MD5 bc9a841f82370c78798b04bc45f6fa2e
SHA1 3ea137a325305a3b98024201f0a6d24959c0334c
SHA512 0c005d11a5dedcaea05a83019b442a4f27cc3f740a12caa380fbfe5e77d54ccb93e89ffecc437235f25f36cbc9a3c8899abf326504439b0a67c75a1a5cc6fee3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2v:VLy2Kerc64CiGImVu8p4kojWh2v
TLSH
T186334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1136-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1136-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3648-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3648-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4860-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads