juko | 72fb38ab0998b6d70d23307f77216c00ba083fe7ba837c93505df2b0183866f4

General

Target
2026-06-01_87d10c1a98b1666088be06c5ac44643a_elex_wannacry.exe
Size 32KB
Sample260601-phf55abv2s
SHA256 72fb38ab0998b6d70d23307f77216c00ba083fe7ba837c93505df2b0183866f4
MD5 87d10c1a98b1666088be06c5ac44643a
SHA1 116de91b083fd5b80c13881e5715745d455210a6
SHA512 5eab3a0c6d97494ec7382cafb3187850ef24c8df1576332d2a833dc6ac2c6d6525e83661c28b83e1552aabbb8f67cbb0d943f5773385771b3d0e77e3a330e9de
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpU:OLsF2Kerc64sTiX2IV0DhuU
TLSH
T182E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral2/files/0x001900000002b53a-3.dat	family_juko
behavioral2/files/0x000400000002a213-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
852	WINWORD.exe
1804	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-1-5-21-125073035-2952146151-721812867-1000\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

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	2026-06-01_87d10c1a98b1666088be06c5ac44643a_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
3800	cmd.exe
2844	PING.EXE
2392	PING.EXE
2964	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2844	PING.EXE
2392	PING.EXE
2964	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4856 wrote to memory of 852	4856	2026-06-01_87d10c1a98b1666088be06c5ac44643a_elex_wannacry.exe	83
PID 852 wrote to memory of 3800	852	WINWORD.exe	84
PID 3800 wrote to memory of 2844	3800	cmd.exe	86
PID 3800 wrote to memory of 2392	3800	cmd.exe	87
PID 3800 wrote to memory of 2964	3800	cmd.exe	88
PID 3800 wrote to memory of 1804	3800	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-06-01_87d10c1a98b1666088be06c5ac44643a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-01_87d10c1a98b1666088be06c5ac44643a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4856
- 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:852
- - 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\00006502" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3800
  - - 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:2844
  - - 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:2392
  - - 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:2964
  - - 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:1804

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00006502

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006502
Size 32KB
SHA256 1357bd615566bf4247db55d9039a742f262c81f723a2e146777ca4d3d087399d
MD5 377010345bef1b6078cfdd48aacd9146
SHA1 541d92d46c3db4c51cbe94a8de03828b46627668
SHA512 3fd54a105971bca84d43d66862ecb4fa92a5e62eedeeeb22684b9dac29fa0ad539820225b78ea20dd0fc48efb5e852a9d68716b94c0b001b589144e1297b0626
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpx:OLsF2Kerc64sTiX2IV0Dhux
TLSH
T1A1E23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 72fb38ab0998b6d70d23307f77216c00ba083fe7ba837c93505df2b0183866f4
MD5 87d10c1a98b1666088be06c5ac44643a
SHA1 116de91b083fd5b80c13881e5715745d455210a6
SHA512 5eab3a0c6d97494ec7382cafb3187850ef24c8df1576332d2a833dc6ac2c6d6525e83661c28b83e1552aabbb8f67cbb0d943f5773385771b3d0e77e3a330e9de
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpU:OLsF2Kerc64sTiX2IV0DhuU
TLSH
T182E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads