juko | d841f8baa1ae5c8da6717da4e598bb628307328dcec82c461cd44f1606f03249

General

Target
2026-06-30_fee0dc3db810f9c77dc8feeb3ccf12c9_elex_wannacry.exe
Size 88KB
Sample260701-ccn8bsd17w
SHA256 d841f8baa1ae5c8da6717da4e598bb628307328dcec82c461cd44f1606f03249
MD5 fee0dc3db810f9c77dc8feeb3ccf12c9
SHA1 7e34b6e2e79aa4a0b8a918b555f9ab02076dae9d
SHA512 160f5f3d48558de62be61bb08814246ae7b92d9a2bdd410fb80e70779c3c80d19294656aab033894382c7882b1d89d81ad4429f637402d131cd647eb4d2a1c43
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs3:zLy2Kerc64CiGImHc/28wzCBlycJWeec
TLSH
T122933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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 7 IoCs

resource	yara_rule
behavioral2/memory/5824-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x00130000000118ff-5.dat	family_juko
behavioral2/memory/5824-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3148-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c659-13.dat	family_juko
behavioral2/memory/6556-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/6556-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3148	WINWORD.exe
6556	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-1-5-21-759331733-200834466-1207319849-1000\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	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	2026-06-30_fee0dc3db810f9c77dc8feeb3ccf12c9_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
1816	PING.EXE
5728	PING.EXE
6628	PING.EXE
1484	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6628	PING.EXE
1816	PING.EXE
5728	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5824 wrote to memory of 3148	5824	2026-06-30_fee0dc3db810f9c77dc8feeb3ccf12c9_elex_wannacry.exe	89
PID 3148 wrote to memory of 1484	3148	WINWORD.exe	90
PID 1484 wrote to memory of 1816	1484	cmd.exe	92
PID 1484 wrote to memory of 5728	1484	cmd.exe	93
PID 1484 wrote to memory of 6628	1484	cmd.exe	94
PID 1484 wrote to memory of 6556	1484	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-06-30_fee0dc3db810f9c77dc8feeb3ccf12c9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-30_fee0dc3db810f9c77dc8feeb3ccf12c9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5824
- 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:3148
- - 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\0000211E" 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:1484
  - - 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:1816
  - - 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:5728
  - - 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:6628
  - - 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:6556

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

0000211E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000211E
Size 88KB
SHA256 7dda571736501781483600689564f485fe8d8d1c2417f61d26efb68355c50990
MD5 99c6da8e5dc36dba8a99b3e93a8db75c
SHA1 1dcdb4660d43b3cfcb739288ff61f02f0794e585
SHA512 e12546cdba70a27c15150c73adb8eeb7833cdf0ed24359f3ebca768bcabbc4105a4b4361d4924c1f069ffd565fcd8344ccfa3b747655abc38053c866d3d10f2e
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsf:zLy2Kerc64CiGImHc/28wzCBlycJWeeo
TLSH
T1C4933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 d841f8baa1ae5c8da6717da4e598bb628307328dcec82c461cd44f1606f03249
MD5 fee0dc3db810f9c77dc8feeb3ccf12c9
SHA1 7e34b6e2e79aa4a0b8a918b555f9ab02076dae9d
SHA512 160f5f3d48558de62be61bb08814246ae7b92d9a2bdd410fb80e70779c3c80d19294656aab033894382c7882b1d89d81ad4429f637402d131cd647eb4d2a1c43
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs3:zLy2Kerc64CiGImHc/28wzCBlycJWeec
TLSH
T122933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3148-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5824-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5824-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/6556-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/6556-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads