juko | 11552adac2741a12554acb4de9a35e45ee7c89579d93a935594b4994a4948d72

General

Target
2026-08-01_5ed4c0fe20da5f6f867315017368e7bf_elex_wannacry.exe
Size 57KB
Sample260802-ay9p2s1bnf
SHA256 11552adac2741a12554acb4de9a35e45ee7c89579d93a935594b4994a4948d72
MD5 5ed4c0fe20da5f6f867315017368e7bf
SHA1 8b1f67e06f0e510a0c5198f40755f314612a5fc4
SHA512 7f4879c6b0114de33b0795551e7b09960a7592a120f1e30f5b23b215e5b14fa2c70e5bce5d07512377a376c45df6eb430e4160fc0975f0108521cf945699a820
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQS:qLy2Kerc64CiGImklNUyp8T5
TLSH
T1B9433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/2624-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/2624-9-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/2344-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x0006000000016cbe-13.dat	family_juko
behavioral2/memory/3096-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3096-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2344	WINWORD.exe
3096	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
1272	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	2026-08-01_5ed4c0fe20da5f6f867315017368e7bf_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
1272	cmd.exe
1412	PING.EXE
4628	PING.EXE
3648	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1412	PING.EXE
4628	PING.EXE
3648	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2624 wrote to memory of 2344	2624	2026-08-01_5ed4c0fe20da5f6f867315017368e7bf_elex_wannacry.exe	89
PID 2344 wrote to memory of 1272	2344	WINWORD.exe	90
PID 1272 wrote to memory of 1412	1272	cmd.exe	92
PID 1272 wrote to memory of 4628	1272	cmd.exe	93
PID 1272 wrote to memory of 3648	1272	cmd.exe	94
PID 1272 wrote to memory of 3096	1272	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_5ed4c0fe20da5f6f867315017368e7bf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_5ed4c0fe20da5f6f867315017368e7bf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2624
- 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:2344
- - 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\00003FAA" 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:1272
  - - 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:4628
  - - 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:3648
  - - 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:3096

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

00003FAA

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003FAA
Size 57KB
SHA256 cca8efdd35d92196a6ac1a967d05cb5a1abfbe9c0b88d22c05b75d4d35e686c5
MD5 09f1853db366d9dcaea2efad500f1b86
SHA1 323d8f0f928afa74fccad6a0df558f2d232fc4df
SHA512 44371bb729b8086debc2e1c5ff1375ddb6f4802ab807c5b5c48e9a102b3dfed8695682a33d06c8adc214b1f9ab1722f4769b3bcbc3ead48f1a79232af429785b
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQB:qLy2Kerc64CiGImklNUyp8Ta
TLSH
T14C433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 11552adac2741a12554acb4de9a35e45ee7c89579d93a935594b4994a4948d72
MD5 5ed4c0fe20da5f6f867315017368e7bf
SHA1 8b1f67e06f0e510a0c5198f40755f314612a5fc4
SHA512 7f4879c6b0114de33b0795551e7b09960a7592a120f1e30f5b23b215e5b14fa2c70e5bce5d07512377a376c45df6eb430e4160fc0975f0108521cf945699a820
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQS:qLy2Kerc64CiGImklNUyp8T5
TLSH
T1B9433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2344-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2624-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2624-9-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3096-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3096-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads