juko | 6c09ae8efb260a8f7ba1af950880be609ed92f0f063db20752c5f0b1d299e7c6

General

Target
2026-07-30_47a398ab4fd936426b105a1f75c4d787_elex_wannacry.exe
Size 49KB
Sample260730-geeh5ace56
SHA256 6c09ae8efb260a8f7ba1af950880be609ed92f0f063db20752c5f0b1d299e7c6
MD5 47a398ab4fd936426b105a1f75c4d787
SHA1 4c92fd342e699f260d37c43e54f0e052a2b14376
SHA512 09f14c9caa967d4fd59e6af4da952b0c0c9aed7514c47970b302a27962683ae08fb71f570da742261eb93c11ca2281eba5c44761c421ca05d7f7bd5ceab6c183
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h29:VLy2Kerc64CiGImVucp4kojWh29
TLSH
T1EA334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
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/4072-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000900000001b85f-5.dat	family_juko
behavioral2/memory/4072-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3340-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c45b-13.dat	family_juko
behavioral2/memory/5960-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5960-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3340	WINWORD.exe
5960	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
5760	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	2026-07-30_47a398ab4fd936426b105a1f75c4d787_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
5760	cmd.exe
6060	PING.EXE
2856	PING.EXE
4216	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6060	PING.EXE
2856	PING.EXE
4216	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4072 wrote to memory of 3340	4072	2026-07-30_47a398ab4fd936426b105a1f75c4d787_elex_wannacry.exe	89
PID 3340 wrote to memory of 5760	3340	WINWORD.exe	90
PID 5760 wrote to memory of 6060	5760	cmd.exe	92
PID 5760 wrote to memory of 2856	5760	cmd.exe	93
PID 5760 wrote to memory of 4216	5760	cmd.exe	94
PID 5760 wrote to memory of 5960	5760	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_47a398ab4fd936426b105a1f75c4d787_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_47a398ab4fd936426b105a1f75c4d787_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4072
- 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:3340
- - 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\000049C9" 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:5760
  - - 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:6060
  - - 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:2856
  - - 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:4216
  - - 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:5960

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

000049C9

Path C:\Users\Admin\AppData\Roaming\Mozilla\000049C9
Size 49KB
SHA256 563b7fa61e024d15e5d7d73d0aeacd7b4fc02078c44646acebb3cf0cc880431f
MD5 db8c49369869f7c2e1f2134bb2cbfdc0
SHA1 728ec87134f75beb66901c157f9961b8e9d550a7
SHA512 8d9d9a2a4d44ded54bf2af7e1d65c8c144fb43bd53b0cc2d56ca6a103f4dec8072e6c5735a63f05ee9fac9b4636e538cb96433ecf0c5e2d24f464ad74aba72f7
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2K:VLy2Kerc64CiGImVucp4kojWh2K
TLSH
T109334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 6c09ae8efb260a8f7ba1af950880be609ed92f0f063db20752c5f0b1d299e7c6
MD5 47a398ab4fd936426b105a1f75c4d787
SHA1 4c92fd342e699f260d37c43e54f0e052a2b14376
SHA512 09f14c9caa967d4fd59e6af4da952b0c0c9aed7514c47970b302a27962683ae08fb71f570da742261eb93c11ca2281eba5c44761c421ca05d7f7bd5ceab6c183
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h29:VLy2Kerc64CiGImVucp4kojWh29
TLSH
T1EA334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3340-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4072-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4072-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5960-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5960-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads