juko | bb3599890b023b310ea1f4fcea28fbf58c2a7b08eac95d9db1527b14adc2a189

General

Target
2026-05-04_042e5da3c4bd57876fccddb0ac3ddd21_elex_wannacry.exe
Size 88KB
Sample260504-ldmkkaft7t
SHA256 bb3599890b023b310ea1f4fcea28fbf58c2a7b08eac95d9db1527b14adc2a189
MD5 042e5da3c4bd57876fccddb0ac3ddd21
SHA1 5fbf0fb0b896a23ed3b53840f3cbfd0cbf5d39fc
SHA512 d5531b9e70a7482bb549bee99082c3671924a1cd0c79ebedc713cc462b361bea2489d0ef8b0c8fab72819be5bc637efa514572ee1719fa93dfce036693decd07
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs4:zLy2Kerc64CiGImHc/28wzCBlycJWeef
TLSH
T1B1933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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 8 IoCs

resource	yara_rule
behavioral2/memory/2464-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000d00000002ad99-5.dat	family_juko
behavioral2/memory/2204-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2464-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2204-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001700000002b492-16.dat	family_juko
behavioral2/memory/4832-18-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4832-19-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2204	WINWORD.exe
4832	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-1-5-21-2397528088-2630719772-1129911217-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-04_042e5da3c4bd57876fccddb0ac3ddd21_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
5136	PING.EXE
5636	cmd.exe
2480	PING.EXE
1064	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2480	PING.EXE
1064	PING.EXE
5136	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2464 wrote to memory of 2204	2464	2026-05-04_042e5da3c4bd57876fccddb0ac3ddd21_elex_wannacry.exe	79
PID 2204 wrote to memory of 5636	2204	WINWORD.exe	80
PID 5636 wrote to memory of 2480	5636	cmd.exe	82
PID 5636 wrote to memory of 1064	5636	cmd.exe	83
PID 5636 wrote to memory of 5136	5636	cmd.exe	84
PID 5636 wrote to memory of 4832	5636	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-04_042e5da3c4bd57876fccddb0ac3ddd21_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_042e5da3c4bd57876fccddb0ac3ddd21_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2464
- 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:2204
- - 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\00007632" 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:5636
  - - 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:2480
  - - 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:1064
  - - 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:5136
  - - 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:4832

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

00007632

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007632
Size 88KB
SHA256 62b0355b24c5f6017397eb85cb02224985001c7c719278ef7f4450d9c8a517f0
MD5 e2dd7532e994a6280b9376b93624a9fe
SHA1 169ae32efd54dd12f6353f5fb506d5ffc73edbed
SHA512 414c19878a8311bbe33d5c1afdcf89e8097d92f7088babb42b36c20267b499971f9411e14156d9804ef31640251a2cea650aace7122b8db4037a5910655b4fbb
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs9:zLy2Kerc64CiGImHc/28wzCBlycJWeea
TLSH
T199933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 bb3599890b023b310ea1f4fcea28fbf58c2a7b08eac95d9db1527b14adc2a189
MD5 042e5da3c4bd57876fccddb0ac3ddd21
SHA1 5fbf0fb0b896a23ed3b53840f3cbfd0cbf5d39fc
SHA512 d5531b9e70a7482bb549bee99082c3671924a1cd0c79ebedc713cc462b361bea2489d0ef8b0c8fab72819be5bc637efa514572ee1719fa93dfce036693decd07
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs4:zLy2Kerc64CiGImHc/28wzCBlycJWeef
TLSH
T1B1933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2204-13-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2204-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2464-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2464-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4832-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4832-19-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads