juko | ca38c2afa222b544643247e3f2d4af77da3872f4335ee8eb392b41d00c0ac831

General

Target
2026-07-27_d19c5f84c7212d2972f4048f5150bad9_elex_wannacry.exe
Size 49KB
Sample260727-tv2d2sca32
SHA256 ca38c2afa222b544643247e3f2d4af77da3872f4335ee8eb392b41d00c0ac831
MD5 d19c5f84c7212d2972f4048f5150bad9
SHA1 e392b4b82dc1f4509ddce510f16d0c06ea37bd03
SHA512 4a955c768b17489491a3ea98cc8083bfdd63b69672775e2bdf33f2c3fe4eb737cbcd91568d8c6e5f07eb3a6dc9e949a4d2a1639f0e516b7839b7b28bd367f347
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2x:VLy2Kerc64CiGImVucp4kojWh2x
TLSH
T174334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/1192-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b315-4.dat	family_juko
behavioral2/memory/1192-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4792-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c541-13.dat	family_juko
behavioral2/memory/2904-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2904-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4792	WINWORD.exe
2904	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
1116	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	2026-07-27_d19c5f84c7212d2972f4048f5150bad9_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
1116	cmd.exe
5964	PING.EXE
4840	PING.EXE
2116	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5964	PING.EXE
4840	PING.EXE
2116	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1192 wrote to memory of 4792	1192	2026-07-27_d19c5f84c7212d2972f4048f5150bad9_elex_wannacry.exe	89
PID 4792 wrote to memory of 1116	4792	WINWORD.exe	90
PID 1116 wrote to memory of 5964	1116	cmd.exe	92
PID 1116 wrote to memory of 4840	1116	cmd.exe	93
PID 1116 wrote to memory of 2116	1116	cmd.exe	94
PID 1116 wrote to memory of 2904	1116	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-27_d19c5f84c7212d2972f4048f5150bad9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_d19c5f84c7212d2972f4048f5150bad9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1192
- 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:4792
- - 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\000039F5" 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:1116
  - - 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:5964
  - - 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:2116
  - - 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:2904

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

000039F5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000039F5
Size 49KB
SHA256 e44406bb9089a610107d02bd66b08743c45699f14a64738e9d2d2f51e2958a49
MD5 2f4bd497b21fba106179bf494951fc1e
SHA1 45ae6bc0c48212bd18104eab4f00bb5a647eb98d
SHA512 d7c05402d3a5dfce2e5855c05819a24f4ba4e1c58597f0a11b5909ea77279213b05ca049268d7dda2e1a72fa05285bc2450663cda8e3cbe87833f843a773c3b4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h24:VLy2Kerc64CiGImVucp4kojWh24
TLSH
T184334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 ca38c2afa222b544643247e3f2d4af77da3872f4335ee8eb392b41d00c0ac831
MD5 d19c5f84c7212d2972f4048f5150bad9
SHA1 e392b4b82dc1f4509ddce510f16d0c06ea37bd03
SHA512 4a955c768b17489491a3ea98cc8083bfdd63b69672775e2bdf33f2c3fe4eb737cbcd91568d8c6e5f07eb3a6dc9e949a4d2a1639f0e516b7839b7b28bd367f347
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2x:VLy2Kerc64CiGImVucp4kojWh2x
TLSH
T174334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1192-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1192-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2904-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2904-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4792-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads