juko | 12380362903bc60f9dae704eaee045584f4eda3c7811e1f066530ef9eddc7b52

General

Target
2026-08-24_1c236f60a9e0ba04c2cf03a05e75c891_elex_wannacry.exe
Size 88KB
Sample260825-wfvztsac49
SHA256 12380362903bc60f9dae704eaee045584f4eda3c7811e1f066530ef9eddc7b52
MD5 1c236f60a9e0ba04c2cf03a05e75c891
SHA1 3ded527b1395e43b5808eff0cc4e02cfe5cd92a2
SHA512 3765c8e626bf04b5a1c04c1810a1b9484f429a5d2a8fe24ea37d856882974d798a874a56f6d47ca8c972f9c2feb9a8c519dc24361f3561e30a80c6c3964f3cb7
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs/:zLy2Kerc64CiGImHc/28wzCBlycJWeeQ
TLSH
T15A933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/5532-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000800000001b884-5.dat	family_juko
behavioral2/memory/5532-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/5444-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c55d-13.dat	family_juko
behavioral2/memory/540-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/540-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5444	WINWORD.exe
540	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-1-5-21-552508041-2681165170-3229858294-1000\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
5476	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-24_1c236f60a9e0ba04c2cf03a05e75c891_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
5476	cmd.exe
1992	PING.EXE
1360	PING.EXE
4688	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1992	PING.EXE
1360	PING.EXE
4688	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5532 wrote to memory of 5444	5532	2026-08-24_1c236f60a9e0ba04c2cf03a05e75c891_elex_wannacry.exe	89
PID 5444 wrote to memory of 5476	5444	WINWORD.exe	90
PID 5476 wrote to memory of 1992	5476	cmd.exe	92
PID 5476 wrote to memory of 1360	5476	cmd.exe	93
PID 5476 wrote to memory of 4688	5476	cmd.exe	94
PID 5476 wrote to memory of 540	5476	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_1c236f60a9e0ba04c2cf03a05e75c891_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_1c236f60a9e0ba04c2cf03a05e75c891_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5532
- 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:5444
- - 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\0000219A" 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:5476
  - - 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:1992
  - - 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:1360
  - - 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:4688
  - - 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:540

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

0000219A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000219A
Size 88KB
SHA256 0a3d3d8ed1a86569700bc06eb1d196420542885d68d7cb1baed78fa7e10c5f1e
MD5 0e6b197a82e5e74deada468fe7a2048a
SHA1 77195a8d9ed3f800e7b77727c277a12effe5d266
SHA512 191b8f0e8a77b11c5e4e7ca7a7ae233864d1285a6936a4a85c4f778a4cc57ffc6cf4d9bff4d58f19eaa78c2f0046a8230e24cc09e8a7ad835015d96c50e2eba5
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsl:zLy2Kerc64CiGImHc/28wzCBlycJWeeC
TLSH
T19C933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 12380362903bc60f9dae704eaee045584f4eda3c7811e1f066530ef9eddc7b52
MD5 1c236f60a9e0ba04c2cf03a05e75c891
SHA1 3ded527b1395e43b5808eff0cc4e02cfe5cd92a2
SHA512 3765c8e626bf04b5a1c04c1810a1b9484f429a5d2a8fe24ea37d856882974d798a874a56f6d47ca8c972f9c2feb9a8c519dc24361f3561e30a80c6c3964f3cb7
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs/:zLy2Kerc64CiGImHc/28wzCBlycJWeeQ
TLSH
T15A933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/540-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/540-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5444-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5532-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5532-10-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads