juko | 821b604e55f3a18f1af92568543772eff4942941b8bd5957cd6af51d902b45bd

General

Target
2026-08-16_ada768f126d027a571e928247446aad4_elex_wannacry.exe
Size 37KB
Sample260816-cdarbsbl7z
SHA256 821b604e55f3a18f1af92568543772eff4942941b8bd5957cd6af51d902b45bd
MD5 ada768f126d027a571e928247446aad4
SHA1 5e7352f91985448899e25fe05e2bb9f3ac83021f
SHA512 b64381e5ff22f0d4fe0cf827a38e3d790d357aad9c84df2f1df4524b83757d2d0bce42cdfbcdf575e23d8cf69e744fe14f913899b009c430c3ab0a436f889faf
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaE:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T11D035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/2968-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85f-5.dat	family_juko
behavioral2/memory/2968-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4132-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b9-13.dat	family_juko
behavioral2/memory/2540-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2540-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4132	WINWORD.exe
2540	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
2668	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-16_ada768f126d027a571e928247446aad4_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

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
2668	cmd.exe
4296	PING.EXE
1004	PING.EXE
1836	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1004	PING.EXE
1836	PING.EXE
4296	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2968 wrote to memory of 4132	2968	2026-08-16_ada768f126d027a571e928247446aad4_elex_wannacry.exe	89
PID 4132 wrote to memory of 2668	4132	WINWORD.exe	90
PID 2668 wrote to memory of 4296	2668	cmd.exe	92
PID 2668 wrote to memory of 1004	2668	cmd.exe	93
PID 2668 wrote to memory of 1836	2668	cmd.exe	94
PID 2668 wrote to memory of 2540	2668	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-16_ada768f126d027a571e928247446aad4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-16_ada768f126d027a571e928247446aad4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2968
- 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:4132
- - 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\00000378" 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:2668
  - - 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:4296
  - - 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:1004
  - - 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:1836
  - - 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:2540

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

00000378

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000378
Size 37KB
SHA256 0cf2b2a5ab3de998061e0467da96a849a4aaf7ac31a736c8e9306684d97c12df
MD5 3c86d52203d4c8d2d2c4d847467bb157
SHA1 a0e08fde372e3cd68abb01dcfa40b258009c5478
SHA512 11c1624d422ae644699fe40352d8511f3c78aaa0ff179db8b7c0da15818f5536d296f9ef3028962a293d66d50bc9b45d752b38482c69c4a53c5b954ea5e80a31
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa7:3LsF2Kerc64sTiX2IV0DhuogwA
TLSH
T175035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 821b604e55f3a18f1af92568543772eff4942941b8bd5957cd6af51d902b45bd
MD5 ada768f126d027a571e928247446aad4
SHA1 5e7352f91985448899e25fe05e2bb9f3ac83021f
SHA512 b64381e5ff22f0d4fe0cf827a38e3d790d357aad9c84df2f1df4524b83757d2d0bce42cdfbcdf575e23d8cf69e744fe14f913899b009c430c3ab0a436f889faf
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaE:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T11D035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2540-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2540-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2968-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2968-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4132-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads