juko | a1056011d895e9892a6a62c546505ed84a779e8f85b84bcb46fcb858f0237164

General

Target
2026-04-19_333364f00c4f486d1362e6aa2626f1c2_elex_wannacry.exe
Size 88KB
Sample260419-e6p3tshw7t
SHA256 a1056011d895e9892a6a62c546505ed84a779e8f85b84bcb46fcb858f0237164
MD5 333364f00c4f486d1362e6aa2626f1c2
SHA1 9bed778d0730d0c77b247a111ff92ef4e0886b4d
SHA512 fa89a70a878f216f76223fa202dd50fecc4792fd65d3219b59517b3974261b28d3cbc1b556371f88b1d0dd9fb26460469c82409290d8d5227ff9950042ea4c6f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsO:sLy2Kerc64CiGIm8so28wzCBlycJWeeV
TLSH
T199933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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
behavioral1/files/0x000e00000001e6c9-4.dat	family_juko
behavioral1/files/0x000800000002441d-14.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-04-19_333364f00c4f486d1362e6aa2626f1c2_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
868	WINWORD.exe
5036	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-1-5-21-914486190-3969805341-592249730-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-19_333364f00c4f486d1362e6aa2626f1c2_elex_wannacry.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
3332	PING.EXE
2884	cmd.exe
4460	PING.EXE
3412	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4460	PING.EXE
3412	PING.EXE
3332	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2812 wrote to memory of 868	2812	2026-04-19_333364f00c4f486d1362e6aa2626f1c2_elex_wannacry.exe	85
PID 868 wrote to memory of 2884	868	WINWORD.exe	86
PID 2884 wrote to memory of 4460	2884	cmd.exe	88
PID 2884 wrote to memory of 3412	2884	cmd.exe	89
PID 2884 wrote to memory of 3332	2884	cmd.exe	91
PID 2884 wrote to memory of 5036	2884	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-04-19_333364f00c4f486d1362e6aa2626f1c2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_333364f00c4f486d1362e6aa2626f1c2_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2812
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:868
- - 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\00003B33" 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:2884
  - - 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:4460
  - - 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:3412
  - - 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:3332
  - - 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:5036

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00003B33

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003B33
Size 88KB
SHA256 438f1ece5b620747795af68bac96eee4ab4e662e4b0d3711057bdd78386ce1f1
MD5 fca8b7abf16a92bf699d7667f638fb25
SHA1 aecbde3a91ec14e19ffcbd2984e2f95958720faa
SHA512 825adcc26d32919db7d5c591c4e0d3dfcc05f29ba79c63ffac4bedf43cd4987bad8bdbdafe1f4644be1f2219e301873c5a648ed3572a94723ab250d6de51c536
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsa:sLy2Kerc64CiGIm8so28wzCBlycJWeeR
TLSH
T18E933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 a1056011d895e9892a6a62c546505ed84a779e8f85b84bcb46fcb858f0237164
MD5 333364f00c4f486d1362e6aa2626f1c2
SHA1 9bed778d0730d0c77b247a111ff92ef4e0886b4d
SHA512 fa89a70a878f216f76223fa202dd50fecc4792fd65d3219b59517b3974261b28d3cbc1b556371f88b1d0dd9fb26460469c82409290d8d5227ff9950042ea4c6f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsO:sLy2Kerc64CiGIm8so28wzCBlycJWeeV
TLSH
T199933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/868-13-0x00000000024F0000-0x0000000002586000-memory.dmp

Download

memory/2812-11-0x0000000002530000-0x00000000025C6000-memory.dmp

Download

memory/5036-16-0x0000000002BB0000-0x0000000002C46000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads