juko | 1295cee85523f249dbd1c4eaaeeb57abf8c46e5acd0db6a1943345712d058325

General

Target
2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe
Size 64KB
Sample260813-bpezrayfph
SHA256 1295cee85523f249dbd1c4eaaeeb57abf8c46e5acd0db6a1943345712d058325
MD5 445cbac72bdc825c32750db0f381cce6
SHA1 15dd3f705441edb76c0a655aaa33a9cbf164eab3
SHA512 f8969ae77be68f588aa2ccc78e5bd4cb2b3057f7dde0b58dee6ee52d1666e70594b3d129fa708a16d46277d87264d2f317bc910b0ed58cc27c45f2c9095e587f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/us:sLy2Kerc64CiGIm8so28s
TLSH
T177535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x0005000000016b45-4.dat	family_juko
behavioral2/files/0x0007000000016b53-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1464	WINWORD.exe
2428	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-1-5-21-4046655672-1449839301-2197395821-1000\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
4956	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	2026-08-12_445cbac72bdc825c32750db0f381cce6_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
3300	PING.EXE
5012	PING.EXE
4956	cmd.exe
2600	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2600	PING.EXE
3300	PING.EXE
5012	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2852 wrote to memory of 1464	2852	2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe	89
PID 1464 wrote to memory of 4956	1464	WINWORD.exe	90
PID 4956 wrote to memory of 2600	4956	cmd.exe	92
PID 4956 wrote to memory of 3300	4956	cmd.exe	93
PID 4956 wrote to memory of 5012	4956	cmd.exe	94
PID 4956 wrote to memory of 2428	4956	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_445cbac72bdc825c32750db0f381cce6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2852
- 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:1464
- - 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\000042E2" 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:4956
  - - 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:2600
  - - 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:3300
  - - 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:5012
  - - 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:2428

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

000042E2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000042E2
Size 64KB
SHA256 4a46224b7e7b4da3d7d75e8507d42872ca4b2424a03f5324a7a7249524d9d0c3
MD5 27af9075f2da4397640ab1cc1ef3d620
SHA1 790714b281197e48e1084142e9dcbcccccff4720
SHA512 49262b82573a0fea31ace430beedf049b710715f40a2ab92cd2c17888eba0d040e76b08263fa813c6fe632c440e032202186ba0174367a91cddc9f21caf4c50c
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uj:sLy2Kerc64CiGIm8so28j
TLSH
T188535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 1295cee85523f249dbd1c4eaaeeb57abf8c46e5acd0db6a1943345712d058325
MD5 445cbac72bdc825c32750db0f381cce6
SHA1 15dd3f705441edb76c0a655aaa33a9cbf164eab3
SHA512 f8969ae77be68f588aa2ccc78e5bd4cb2b3057f7dde0b58dee6ee52d1666e70594b3d129fa708a16d46277d87264d2f317bc910b0ed58cc27c45f2c9095e587f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/us:sLy2Kerc64CiGIm8so28s
TLSH
T177535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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