juko | afa71af21ef51df814c02cebc0eac717f4679b8d1f76795e493cd13e2339129d

General

Target
2026-08-20_18429f11d669f904ca9bfe032671bca4_elex_wannacry.exe
Size 64KB
Sample260820-bmax1scq8t
SHA256 afa71af21ef51df814c02cebc0eac717f4679b8d1f76795e493cd13e2339129d
MD5 18429f11d669f904ca9bfe032671bca4
SHA1 2bba5b3d1fe6713769b90279850a4b569c13bc71
SHA512 d0057c257eb020b44d77626df483fd6fb099c4441b66a18afe94cc86c43d14fb627b99a74b6cc2d7d3b221be60642835b4fa6ca7c8f155657e4b6facf8eb2854
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uG:sLy2Kerc64CiGIm8so28G
TLSH
T1A9536C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000700000001b85f-4.dat	family_juko
behavioral2/files/0x000e00000001c54b-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4364	WINWORD.exe
3272	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-1-5-21-3797332335-34111092-3597280141-1000\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
3432	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	2026-08-20_18429f11d669f904ca9bfe032671bca4_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
3432	cmd.exe
5612	PING.EXE
248	PING.EXE
4332	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5612	PING.EXE
248	PING.EXE
4332	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4420 wrote to memory of 4364	4420	2026-08-20_18429f11d669f904ca9bfe032671bca4_elex_wannacry.exe	89
PID 4364 wrote to memory of 3432	4364	WINWORD.exe	90
PID 3432 wrote to memory of 5612	3432	cmd.exe	92
PID 3432 wrote to memory of 248	3432	cmd.exe	93
PID 3432 wrote to memory of 4332	3432	cmd.exe	94
PID 3432 wrote to memory of 3272	3432	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-20_18429f11d669f904ca9bfe032671bca4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-20_18429f11d669f904ca9bfe032671bca4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4420
- 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:4364
- - 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\00002D29" 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:3432
  - - 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:5612
  - - 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:248
  - - 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:4332
  - - 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:3272

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

00002D29

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002D29
Size 64KB
SHA256 191d48a844db0f8e37e465230febe0c88c7bca65a5865207b3ac98ff9cb1a383
MD5 7cb7da111e25318e5a08225805030593
SHA1 681cf3621244794ad7e15dbc59a8dedf181ee7ba
SHA512 a151b1d715acbcbdce431192d43139bd5438c79b2b271c8fb5186e077344a473ccfd0e7d5c0ef24c95fc1af0b3a44799a7037ab52458208119e24d5516238447
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ue:sLy2Kerc64CiGIm8so28e
TLSH
T199535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 afa71af21ef51df814c02cebc0eac717f4679b8d1f76795e493cd13e2339129d
MD5 18429f11d669f904ca9bfe032671bca4
SHA1 2bba5b3d1fe6713769b90279850a4b569c13bc71
SHA512 d0057c257eb020b44d77626df483fd6fb099c4441b66a18afe94cc86c43d14fb627b99a74b6cc2d7d3b221be60642835b4fa6ca7c8f155657e4b6facf8eb2854
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uG:sLy2Kerc64CiGIm8so28G
TLSH
T1A9536C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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