juko | c384dad1d3c44ebaaef0c13447fd78f3f6ebb54ce394ec43e20975cb89227fa5

General

Target
2026-07-28_0710c081016fd8c87805a3994fb8c47f_elex_wannacry.exe
Size 49KB
Sample260729-ca533asbmg
SHA256 c384dad1d3c44ebaaef0c13447fd78f3f6ebb54ce394ec43e20975cb89227fa5
MD5 0710c081016fd8c87805a3994fb8c47f
SHA1 681e69e1470a154d2168e1d0e2868cd23b84f182
SHA512 902eabd92e58b3a034d4a41feee98e402bc05b4d3da74163d7956509b79cdb08198eb6ec1a79d800a0db560349148abe90a25cd4b0e68d0675bdb6560d0d3ee8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2r:VLy2Kerc64CiGImVucp4kojWh2r
TLSH
T18B334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/820-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000c00000001b840-5.dat	family_juko
behavioral2/memory/820-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5356-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c452-13.dat	family_juko
behavioral2/memory/2080-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2080-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5356	WINWORD.exe
2080	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-1-5-21-3989226554-2204910950-1522900112-1000\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
4080	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-28_0710c081016fd8c87805a3994fb8c47f_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

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
4080	cmd.exe
4152	PING.EXE
3796	PING.EXE
4100	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4100	PING.EXE
4152	PING.EXE
3796	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 820 wrote to memory of 5356	820	2026-07-28_0710c081016fd8c87805a3994fb8c47f_elex_wannacry.exe	89
PID 5356 wrote to memory of 4080	5356	WINWORD.exe	90
PID 4080 wrote to memory of 4152	4080	cmd.exe	92
PID 4080 wrote to memory of 3796	4080	cmd.exe	93
PID 4080 wrote to memory of 4100	4080	cmd.exe	94
PID 4080 wrote to memory of 2080	4080	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-28_0710c081016fd8c87805a3994fb8c47f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_0710c081016fd8c87805a3994fb8c47f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:820
- 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:5356
- - 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\0000686F" 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:4080
  - - 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:4152
  - - 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:3796
  - - 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:4100
  - - 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:2080

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

0000686F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000686F
Size 49KB
SHA256 ed5e28ac1ff1d44f38e4b938a7cdd255bfa43b5d09b4751119638c92cd6afbea
MD5 ccb0a7fe557cc47f371354b9da8bd6c0
SHA1 7a51a458b2dfa8a46b3030726766652cf6d83f98
SHA512 1351e43a36d046233c1a23d1a404b0ff7354677f473972f26f49c84317de20ce994b6931d7736a1d4e6255936ecc53fecda60a45ab396a9baf5e1d5668f9fa8e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2V:VLy2Kerc64CiGImVucp4kojWh2V
TLSH
T1B4334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 c384dad1d3c44ebaaef0c13447fd78f3f6ebb54ce394ec43e20975cb89227fa5
MD5 0710c081016fd8c87805a3994fb8c47f
SHA1 681e69e1470a154d2168e1d0e2868cd23b84f182
SHA512 902eabd92e58b3a034d4a41feee98e402bc05b4d3da74163d7956509b79cdb08198eb6ec1a79d800a0db560349148abe90a25cd4b0e68d0675bdb6560d0d3ee8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2r:VLy2Kerc64CiGImVucp4kojWh2r
TLSH
T18B334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/820-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/820-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2080-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2080-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5356-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads