juko | 90b94c7c24df4fab20aeefc9e91cccea9986ba5643171f99adcbdc69576c6ff3

General

Target
2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe
Size 49KB
Sample260810-gftdnssbme
SHA256 90b94c7c24df4fab20aeefc9e91cccea9986ba5643171f99adcbdc69576c6ff3
MD5 e7d4595da18c43ef5cc9c031929b4075
SHA1 dc99507d49da8dd146c8551a0a1f18f804540fc2
SHA512 b3a14132fb228f80b1e2d727d6889dd94e59f2d5133faad9bf2611833b9c7f6a4b6681b17170677dfa4d2f671118d079ea840ab92c1cc508f4e66e00835d63ec
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T1C1334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral2/memory/4636-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00090000000068df-5.dat	family_juko
behavioral2/memory/4636-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2032-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0006000000016b3f-13.dat	family_juko
behavioral2/memory/2156-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2156-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2032	WINWORD.exe
2156	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-1-5-21-1738198120-2966725515-3980530802-1000\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
264	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_e7d4595da18c43ef5cc9c031929b4075_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

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
264	cmd.exe
6056	PING.EXE
5136	PING.EXE
2704	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6056	PING.EXE
5136	PING.EXE
2704	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4636 wrote to memory of 2032	4636	2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe	90
PID 2032 wrote to memory of 264	2032	WINWORD.exe	91
PID 264 wrote to memory of 6056	264	cmd.exe	93
PID 264 wrote to memory of 5136	264	cmd.exe	94
PID 264 wrote to memory of 2704	264	cmd.exe	95
PID 264 wrote to memory of 2156	264	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4636
- 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:2032
- - 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\000064F0" 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:264
  - - 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:6056
  - - 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:5136
  - - 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:2704
  - - 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:2156

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

000064F0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000064F0
Size 49KB
SHA256 5998e46bb4f1755e3ce90cc80a13a9aa5106a12c40043b5a9acdd01cc812522a
MD5 de509d3fbcfb915dab8b82295e11af6a
SHA1 fd93b4b3bd92a63c07097a59e79ce5d7fb337710
SHA512 8461f408c6749529086b97ea8716edd1515827e2df7c82defc7813c199e4e425d8db5e8df73ffeabeb57b7e80c3bbc4a8cb150abd799ec48991c08f664eec819
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2q:VLy2Kerc64CiGImVucp4kojWh2q
TLSH
T176334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 90b94c7c24df4fab20aeefc9e91cccea9986ba5643171f99adcbdc69576c6ff3
MD5 e7d4595da18c43ef5cc9c031929b4075
SHA1 dc99507d49da8dd146c8551a0a1f18f804540fc2
SHA512 b3a14132fb228f80b1e2d727d6889dd94e59f2d5133faad9bf2611833b9c7f6a4b6681b17170677dfa4d2f671118d079ea840ab92c1cc508f4e66e00835d63ec
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T1C1334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2032-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2156-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2156-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4636-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4636-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads