juko | af2a5f08da753d7ac99d80e2a81455c3f17b8421ee62ca1fe8f89c09c7df90ef

General

Target
2026-08-04_922a4e0b808561db94ad56a61cdb629b_elex_wannacry.exe
Size 64KB
Sample260804-g2dv4ssgpe
SHA256 af2a5f08da753d7ac99d80e2a81455c3f17b8421ee62ca1fe8f89c09c7df90ef
MD5 922a4e0b808561db94ad56a61cdb629b
SHA1 bd412113fb983dd7807a7c782d42613a67066657
SHA512 56b65b1c5b0f1b3433bf320da241a285b55ef3c9999689d281b31a74861ee365778248490292c6e14f4aa2d1938277f652203f6cc40658eb4ca1ce9182bac160
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u4:sLy2Kerc64CiGIm8so284
TLSH
T143535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000c000000011371-4.dat	family_juko
behavioral2/files/0x001100000001c505-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2940	WINWORD.exe
3260	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-1-5-21-1875162379-3804078649-638427191-1000\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
3016	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	2026-08-04_922a4e0b808561db94ad56a61cdb629b_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
5492	PING.EXE
3016	cmd.exe
2912	PING.EXE
4840	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2912	PING.EXE
4840	PING.EXE
5492	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 928 wrote to memory of 2940	928	2026-08-04_922a4e0b808561db94ad56a61cdb629b_elex_wannacry.exe	89
PID 2940 wrote to memory of 3016	2940	WINWORD.exe	90
PID 3016 wrote to memory of 2912	3016	cmd.exe	92
PID 3016 wrote to memory of 4840	3016	cmd.exe	93
PID 3016 wrote to memory of 5492	3016	cmd.exe	94
PID 3016 wrote to memory of 3260	3016	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_922a4e0b808561db94ad56a61cdb629b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_922a4e0b808561db94ad56a61cdb629b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:928
- 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:2940
- - 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\000028EF" 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:3016
  - - 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:2912
  - - 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:4840
  - - 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:5492
  - - 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:3260

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

000028EF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000028EF
Size 64KB
SHA256 a49f21b14db976977f6dc86c111c9a8a698f8b78019d5f34ee0bce38620eebd3
MD5 3427c7c812952359482fb171cf772b22
SHA1 8a3d53ce80949de16047dd838ce58a4dba2def9c
SHA512 bf0732c6516b1947c7f3e42ae6c8881ee5ac49e8803c521ae030c757c015919b91818ad7e59d083e6ee54aa2462f9a0a609e937c2c0776a8d1543ee92079bbac
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uD:sLy2Kerc64CiGIm8so28D
TLSH
T17C535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 af2a5f08da753d7ac99d80e2a81455c3f17b8421ee62ca1fe8f89c09c7df90ef
MD5 922a4e0b808561db94ad56a61cdb629b
SHA1 bd412113fb983dd7807a7c782d42613a67066657
SHA512 56b65b1c5b0f1b3433bf320da241a285b55ef3c9999689d281b31a74861ee365778248490292c6e14f4aa2d1938277f652203f6cc40658eb4ca1ce9182bac160
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u4:sLy2Kerc64CiGIm8so284
TLSH
T143535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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