juko | 16aed48ad5e2517769aa8b83fe5bdbea5163c0e3d0df4054f65c1e646263d7ec

General

Target
2026-08-31_fa6684a4aa88ec90d68f53ab1e1b1d21_elex_wannacry.exe
Size 53KB
Sample260901-2ylf1afb68
SHA256 16aed48ad5e2517769aa8b83fe5bdbea5163c0e3d0df4054f65c1e646263d7ec
MD5 fa6684a4aa88ec90d68f53ab1e1b1d21
SHA1 5df820ac4d1ae2b15c7ff464550fec13b195e43e
SHA512 a42a1e39e14f0100abfa883c70cbaab748a1cfe750906a70585ad7cab46793c4f8e322ef647d48a193bdfc5b8b7f8788dcf98510179217b00ac165372ceb2d3c
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq21:3Ly2Kerc64CiGIm1tcBMUOOF1
TLSH
T1D1335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000700000001b896-4.dat	family_juko
behavioral2/files/0x000f00000001c47f-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1676	WINWORD.exe
4376	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-1-5-21-189034102-168398478-1159367937-1000\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
4392	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	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	2026-08-31_fa6684a4aa88ec90d68f53ab1e1b1d21_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

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
3620	PING.EXE
4440	PING.EXE
4952	PING.EXE
4392	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3620	PING.EXE
4440	PING.EXE
4952	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4380 wrote to memory of 1676	4380	2026-08-31_fa6684a4aa88ec90d68f53ab1e1b1d21_elex_wannacry.exe	89
PID 1676 wrote to memory of 4392	1676	WINWORD.exe	90
PID 4392 wrote to memory of 3620	4392	cmd.exe	92
PID 4392 wrote to memory of 4440	4392	cmd.exe	93
PID 4392 wrote to memory of 4952	4392	cmd.exe	94
PID 4392 wrote to memory of 4376	4392	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-31_fa6684a4aa88ec90d68f53ab1e1b1d21_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-31_fa6684a4aa88ec90d68f53ab1e1b1d21_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4380
- 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:1676
- - 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\00002DA4" 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:4392
  - - 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:3620
  - - 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:4440
  - - 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:4952
  - - 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:4376

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

00002DA4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002DA4
Size 53KB
SHA256 692264db60a9f51b7f4ea015d04027b8c4a470d02261d2f1af437c131c1cd1e6
MD5 d71a221e642d112a4c153af84bd0308f
SHA1 20acffc8994bb820e90a4144c7a4ed27f799a7aa
SHA512 8c4a6c40a4d72ac03b55d0de84444810835ad023ab0fec75b80e6385f48de60b0fb2aca07d5d7900c8831b898c86544bd6278c5c966340f4eb3610eb2d335bc5
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2h:3Ly2Kerc64CiGIm1tcBMUOOFh
TLSH
T175335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 16aed48ad5e2517769aa8b83fe5bdbea5163c0e3d0df4054f65c1e646263d7ec
MD5 fa6684a4aa88ec90d68f53ab1e1b1d21
SHA1 5df820ac4d1ae2b15c7ff464550fec13b195e43e
SHA512 a42a1e39e14f0100abfa883c70cbaab748a1cfe750906a70585ad7cab46793c4f8e322ef647d48a193bdfc5b8b7f8788dcf98510179217b00ac165372ceb2d3c
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq21:3Ly2Kerc64CiGIm1tcBMUOOF1
TLSH
T1D1335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads