juko | 27d0f4ce8e25e1158fb43c49f7e7a8b036ab601ecaf405b0108ab5b79fc1c9a9

General

Target
2026-04-16_f529ef6c3a1d653155ef95cc34452723_elex_wannacry.exe
Size 86KB
Sample260416-kx3kfsey6v
SHA256 27d0f4ce8e25e1158fb43c49f7e7a8b036ab601ecaf405b0108ab5b79fc1c9a9
MD5 f529ef6c3a1d653155ef95cc34452723
SHA1 065bc137771e29c07a2a88bfe33daeb60804793c
SHA512 299b5591c5626141e0bc3759e6be90fe0b93f8601f7e758611dcd55363215579cd3a9298f5de39ce1fe6b8b92a4e31d8b75f1e388e79fb3fe59ddeb508ef349f
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpC:vLy2Kerc64CiGImMPu/ouEQkwpC
TLSH
T1C083C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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/3404-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b1fd-5.dat	family_juko
behavioral2/memory/3404-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/748-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b485-15.dat	family_juko
behavioral2/memory/3100-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3100-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
748	WINWORD.exe
3100	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-1-5-21-2122505878-652277452-2375749442-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-16_f529ef6c3a1d653155ef95cc34452723_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

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
4416	cmd.exe
3144	PING.EXE
3392	PING.EXE
3108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3144	PING.EXE
3392	PING.EXE
3108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3404 wrote to memory of 748	3404	2026-04-16_f529ef6c3a1d653155ef95cc34452723_elex_wannacry.exe	80
PID 748 wrote to memory of 4416	748	WINWORD.exe	81
PID 4416 wrote to memory of 3144	4416	cmd.exe	83
PID 4416 wrote to memory of 3392	4416	cmd.exe	84
PID 4416 wrote to memory of 3108	4416	cmd.exe	85
PID 4416 wrote to memory of 3100	4416	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-16_f529ef6c3a1d653155ef95cc34452723_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-16_f529ef6c3a1d653155ef95cc34452723_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3404
- 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:748
- - 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\00004E21" 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:4416
  - - 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:3144
  - - 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:3392
  - - 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:3108
  - - 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:3100

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

00004E21

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004E21
Size 86KB
SHA256 d48c23b47f1f3d71b27c9f2202ee12d54fff8ce7db8e37ea1016020de0387f13
MD5 f565883e996cf0557c73a127f8e63824
SHA1 fde912ac132e21595beceda989cd3331e4e4df65
SHA512 b793ba17bfb0f9557790400d0e0a31bd52d378e1ab84125441489f17ff3eab849491bee884b3b3ad5141efb59a5dc6886061ba26977734140ecbca1f88e3a752
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpH:vLy2Kerc64CiGImMPu/ouEQkwpH
TLSH
T14183C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 27d0f4ce8e25e1158fb43c49f7e7a8b036ab601ecaf405b0108ab5b79fc1c9a9
MD5 f529ef6c3a1d653155ef95cc34452723
SHA1 065bc137771e29c07a2a88bfe33daeb60804793c
SHA512 299b5591c5626141e0bc3759e6be90fe0b93f8601f7e758611dcd55363215579cd3a9298f5de39ce1fe6b8b92a4e31d8b75f1e388e79fb3fe59ddeb508ef349f
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpC:vLy2Kerc64CiGImMPu/ouEQkwpC
TLSH
T1C083C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/748-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3100-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3100-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3404-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3404-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads