juko | 545d2a063561f3f1e6e015bd995c024d9d75c21726d0fd25b501b378e0e7da2d

General

Target
2026-05-22_292331c366f0f41aa6443a7fda5e5c9f_elex_wannacry.exe
Size 64KB
Sample260522-j9tmmsax7v
SHA256 545d2a063561f3f1e6e015bd995c024d9d75c21726d0fd25b501b378e0e7da2d
MD5 292331c366f0f41aa6443a7fda5e5c9f
SHA1 9c887f0caa5c53cbc83831b5f8555e5d6ee05566
SHA512 437f141e98157a0ae4031cbb7737b0d08fede56e6ab2440c03aec7c0dd1cc5388f4ada055acace325c8a98a3fda3c14a26eecc441dddda9cf7c8ff43a6daa7d8
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/up:sLy2Kerc64CiGIm8so28p
TLSH
T101536C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x0010000000025c9a-4.dat	family_juko
behavioral2/files/0x001b00000002b5f8-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4192	WINWORD.exe
5984	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-1-5-21-2746394149-3500112804-1243524366-1000\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

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	2026-05-22_292331c366f0f41aa6443a7fda5e5c9f_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
3712	cmd.exe
684	PING.EXE
5804	PING.EXE
5308	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
684	PING.EXE
5804	PING.EXE
5308	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5444 wrote to memory of 4192	5444	2026-05-22_292331c366f0f41aa6443a7fda5e5c9f_elex_wannacry.exe	80
PID 4192 wrote to memory of 3712	4192	WINWORD.exe	81
PID 3712 wrote to memory of 684	3712	cmd.exe	83
PID 3712 wrote to memory of 5804	3712	cmd.exe	84
PID 3712 wrote to memory of 5308	3712	cmd.exe	85
PID 3712 wrote to memory of 5984	3712	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-22_292331c366f0f41aa6443a7fda5e5c9f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-22_292331c366f0f41aa6443a7fda5e5c9f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5444
- 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:4192
- - 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\00007E20" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3712
  - - 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:684
  - - 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:5804
  - - 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:5308
  - - 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:5984

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00007E20

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007E20
Size 64KB
SHA256 f23a9fe7156d8dfaea3fd0fe8a76154d4045c9308129da457cbb58ee5eeb97e5
MD5 6e57a75d685d66c57058a33b0e788d92
SHA1 b4185965d793aecc5d79602af09d3a31824d9fda
SHA512 8d40da2814aae68ed6bd1f70c28f45f572dfbd44718b22343e5879de29a770a3986e2962fe54fd58e831212e4bc2512645b53fdc285cc5ae0bc02adc4496e6ec
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u3:sLy2Kerc64CiGIm8so283
TLSH
T148535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 545d2a063561f3f1e6e015bd995c024d9d75c21726d0fd25b501b378e0e7da2d
MD5 292331c366f0f41aa6443a7fda5e5c9f
SHA1 9c887f0caa5c53cbc83831b5f8555e5d6ee05566
SHA512 437f141e98157a0ae4031cbb7737b0d08fede56e6ab2440c03aec7c0dd1cc5388f4ada055acace325c8a98a3fda3c14a26eecc441dddda9cf7c8ff43a6daa7d8
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/up:sLy2Kerc64CiGIm8so28p
TLSH
T101536C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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