juko | 1ea8b274a7c759b2451e2b8f6d08a3274abb4adeaa6b881f66704774c3169ae3

General

Target
2026-10-22_757b1190f57e94f419e42efc9053431d_elex_wannacry.exe
Size 88KB
Sample261024-kapp3sgx9t
SHA256 1ea8b274a7c759b2451e2b8f6d08a3274abb4adeaa6b881f66704774c3169ae3
MD5 757b1190f57e94f419e42efc9053431d
SHA1 14cdd416a42326f570fb0eb3c48dc7088869ac29
SHA512 dbd1bb0282745eec5b33906c49495821851bffaef1a00d10e32427ffe627d77417036a0d3133e9e5c234d5ea3872ce1dee4b0ab44142046e8616ee9b8141bf5b
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsa:sLy2Kerc64CiGIm8so28wzCBlycJWeeN
TLSH
T110933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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/0x00170000000115b3-3.dat	family_juko
behavioral2/files/0x000b00000001b880-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1604	WINWORD.exe
5732	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-1-5-21-4057491610-3392471755-192832105-1000\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
8	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-22_757b1190f57e94f419e42efc9053431d_elex_wannacry.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
8	cmd.exe
3820	PING.EXE
4320	PING.EXE
3936	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3820	PING.EXE
4320	PING.EXE
3936	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3900 wrote to memory of 1604	3900	2026-10-22_757b1190f57e94f419e42efc9053431d_elex_wannacry.exe	90
PID 1604 wrote to memory of 8	1604	WINWORD.exe	91
PID 8 wrote to memory of 3820	8	cmd.exe	93
PID 8 wrote to memory of 4320	8	cmd.exe	94
PID 8 wrote to memory of 3936	8	cmd.exe	95
PID 8 wrote to memory of 5732	8	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-22_757b1190f57e94f419e42efc9053431d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_757b1190f57e94f419e42efc9053431d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3900
- 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:1604
- - 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\0000742A" 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:8
  - - 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:3820
  - - 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:4320
  - - 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:3936
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:5732

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000742A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000742A
Size 88KB
SHA256 3062a48e2bbbfd6ad50dd0d20af060fca09b8137da7d7b7959c36d3e183bdb60
MD5 7a0c4c46c29d3326047f8a61a3838128
SHA1 46117f934ac0b4fa579eb24ea45ec20a47fde5e6
SHA512 814acf986d08d6ab9f85a64fcba236812428ccdb76198e17110e1879650688322d8eb0e24c3a52f156515163c3e3d24c9b8da0aaeef561c252b640bd9acf5962
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsV:sLy2Kerc64CiGIm8so28wzCBlycJWeeO
TLSH
T147933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 1ea8b274a7c759b2451e2b8f6d08a3274abb4adeaa6b881f66704774c3169ae3
MD5 757b1190f57e94f419e42efc9053431d
SHA1 14cdd416a42326f570fb0eb3c48dc7088869ac29
SHA512 dbd1bb0282745eec5b33906c49495821851bffaef1a00d10e32427ffe627d77417036a0d3133e9e5c234d5ea3872ce1dee4b0ab44142046e8616ee9b8141bf5b
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsa:sLy2Kerc64CiGIm8so28wzCBlycJWeeN
TLSH
T110933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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