juko | ec39e45803d6811f64b75ee264008145a2044f00f3cf8774a3ca11353af1170b

General

Target
2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe
Size 87KB
Sample260517-tl7jpsex8p
SHA256 ec39e45803d6811f64b75ee264008145a2044f00f3cf8774a3ca11353af1170b
MD5 fd612b144ba2e8cac877aec5e6eaa32d
SHA1 29b717d3f60101cab387a07dad95827cfd8ae780
SHA512 8a2cf33a42ab52aa10867b6280380d6c0d973699b1870d12d15673b410a9909fd8ac0bac7684f12dee2eaa6f57cec53aba2447c67a7931f254f7674f2b16eb8f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T1B393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/8-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000002af1f-5.dat	family_juko
behavioral2/memory/8-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4416-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b77e-15.dat	family_juko
behavioral2/memory/4932-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4932-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4416	WINWORD.exe
4932	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-1-5-21-1768642833-2142038154-4041560723-1000\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	2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_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
5180	PING.EXE
3752	PING.EXE
2496	PING.EXE
4336	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2496	PING.EXE
5180	PING.EXE
3752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 8 wrote to memory of 4416	8	2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe	79
PID 4416 wrote to memory of 4336	4416	WINWORD.exe	80
PID 4336 wrote to memory of 2496	4336	cmd.exe	82
PID 4336 wrote to memory of 5180	4336	cmd.exe	83
PID 4336 wrote to memory of 3752	4336	cmd.exe	84
PID 4336 wrote to memory of 4932	4336	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_fd612b144ba2e8cac877aec5e6eaa32d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:8
- 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:4416
- - 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\00005F3B" 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:4336
  - - 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:2496
  - - 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:5180
  - - 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:3752
  - - 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:4932

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

00005F3B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005F3B
Size 87KB
SHA256 5682237dd1a46c44286ef3899010b1445f5687f5e8d03540691ef3eb9d36102e
MD5 dd3b14360b476ece259baff1bb53e61e
SHA1 b2cb5eaa9b9d7d459842ef4075e847f21f5f2ff7
SHA512 e2776e892696751239145f6b52fb9d3e876836fd5cbc66b03196bcc2253cbd4c153f59bcec485c9173df15b1172835f9252725ac79253c5f0e3a267bfebbd106
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwph:2Ly2Kerc64CiGIm1K851YO6EQkwph
TLSH
T15593A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 ec39e45803d6811f64b75ee264008145a2044f00f3cf8774a3ca11353af1170b
MD5 fd612b144ba2e8cac877aec5e6eaa32d
SHA1 29b717d3f60101cab387a07dad95827cfd8ae780
SHA512 8a2cf33a42ab52aa10867b6280380d6c0d973699b1870d12d15673b410a9909fd8ac0bac7684f12dee2eaa6f57cec53aba2447c67a7931f254f7674f2b16eb8f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T1B393A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/8-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/8-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4416-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4932-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4932-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads