juko | 38ff286cec3acc2eb03d0c4b673a7e678f22527b48b6714e93bd23acc33e9f6a

General

Target
2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe
Size 37KB
Sample260809-en7vxstvay
SHA256 38ff286cec3acc2eb03d0c4b673a7e678f22527b48b6714e93bd23acc33e9f6a
MD5 8a07f3531bdcc7037f18ac674e9fc8c9
SHA1 9714392fef7fdafe47c38557882786d70adac7ca
SHA512 42713e5b71602bd8355f115cb34985bfa0133adaa5e81b3a52a0474f483e0875bd90e31d3e4c17102818a49532ae3d78ea3d58b9048f28e2e06d480f29858e3a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaW:3LsF2Kerc64sTiX2IV0DhuogwZ
TLSH
T10E035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/5900-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/5900-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2400-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c56c-13.dat	family_juko
behavioral2/memory/5300-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5300-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2400	WINWORD.exe
5300	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
1316	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	2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_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
1316	cmd.exe
2220	PING.EXE
1700	PING.EXE
4832	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2220	PING.EXE
1700	PING.EXE
4832	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5900 wrote to memory of 2400	5900	2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe	89
PID 2400 wrote to memory of 1316	2400	WINWORD.exe	90
PID 1316 wrote to memory of 2220	1316	cmd.exe	92
PID 1316 wrote to memory of 1700	1316	cmd.exe	93
PID 1316 wrote to memory of 4832	1316	cmd.exe	94
PID 1316 wrote to memory of 5300	1316	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5900
- 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:2400
- - 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\0000295F" 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:1316
  - - 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:2220
  - - 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:1700
  - - 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:4832
  - - 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:5300

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

0000295F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000295F
Size 37KB
SHA256 f3a1dc26d56174f35605f0509d1d5d4fd5f7e2e8c56e0a98f9d3da1bee5eb4c0
MD5 094f8ed0d9b9ed46dac2ca6f7a7b257e
SHA1 37812ef229aba15bc2d2b45b034181283862c392
SHA512 c621824e7133be2e4737c0ed248a4308661c7a91d6d002da4cc144c7c2b287fd2e8eebcc7d98ee1a25f5394ec7d197a84c0aa8a7a99bee4034d50c43cdb67b81
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T18A035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 38ff286cec3acc2eb03d0c4b673a7e678f22527b48b6714e93bd23acc33e9f6a
MD5 8a07f3531bdcc7037f18ac674e9fc8c9
SHA1 9714392fef7fdafe47c38557882786d70adac7ca
SHA512 42713e5b71602bd8355f115cb34985bfa0133adaa5e81b3a52a0474f483e0875bd90e31d3e4c17102818a49532ae3d78ea3d58b9048f28e2e06d480f29858e3a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaW:3LsF2Kerc64sTiX2IV0DhuogwZ
TLSH
T10E035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2400-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5300-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5300-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5900-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5900-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads