juko | 56bc7b2aa66ead41e0fe93c3f9c060bd9665aed8ba489a854967a562d6d2da1a

General

Target
2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe
Size 49KB
Sample260727-qh99mstses
SHA256 56bc7b2aa66ead41e0fe93c3f9c060bd9665aed8ba489a854967a562d6d2da1a
MD5 4d2b147ee611a31bf36e9ceafba79a68
SHA1 55e84724446730481cc62a4fa660f2acc17753d3
SHA512 009e093c737b763f6222e505ab503da3ad720faf62104b16648cf64877f078f9d99d349907fd6ee5969200b5c7fed31e33086c29b92fbd31f5ddbf7eda113cd3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2R:VLy2Kerc64CiGImVucp4kojWh2R
TLSH
T19C334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA740765A1C72D6BCF30E9E
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/752-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c000000011377-5.dat	family_juko
behavioral2/memory/752-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/6100-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c448-13.dat	family_juko
behavioral2/memory/2120-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2120-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6100	WINWORD.exe
2120	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
2448	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_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
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
4500	PING.EXE
1468	PING.EXE
3656	PING.EXE
2448	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3656	PING.EXE
4500	PING.EXE
1468	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 752 wrote to memory of 6100	752	2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe	89
PID 6100 wrote to memory of 2448	6100	WINWORD.exe	90
PID 2448 wrote to memory of 4500	2448	cmd.exe	92
PID 2448 wrote to memory of 1468	2448	cmd.exe	93
PID 2448 wrote to memory of 3656	2448	cmd.exe	94
PID 2448 wrote to memory of 2120	2448	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_4d2b147ee611a31bf36e9ceafba79a68_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:752
- 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:6100
- - 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\00000FF2" 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:2448
  - - 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:4500
  - - 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:1468
  - - 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:3656
  - - 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:2120

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

00000FF2

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000FF2
Size 49KB
SHA256 25caa154a1474e5bbbda4d422b797c924162b23f1c011967ab22262a3231f703
MD5 20e1eb9fb8a19a4a56fc59de72a871fa
SHA1 20fc88c565fc466ea01a67291b307bed25c7e782
SHA512 1e2a9e00f358dad6f042435fdb57e70768ecef2cd2787ad484825b368dd749109d0d6a7aa473e81e41ac890bb356d2d244483802e4cf976fa0b7856e658a5130
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2b:VLy2Kerc64CiGImVucp4kojWh2b
TLSH
T1B6334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 56bc7b2aa66ead41e0fe93c3f9c060bd9665aed8ba489a854967a562d6d2da1a
MD5 4d2b147ee611a31bf36e9ceafba79a68
SHA1 55e84724446730481cc62a4fa660f2acc17753d3
SHA512 009e093c737b763f6222e505ab503da3ad720faf62104b16648cf64877f078f9d99d349907fd6ee5969200b5c7fed31e33086c29b92fbd31f5ddbf7eda113cd3
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2R:VLy2Kerc64CiGImVucp4kojWh2R
TLSH
T19C334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/752-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/752-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2120-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2120-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/6100-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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