juko | a2f4a2f6961282c4ae69397527567d9fcbb66a0cfd2d61d9f36ec42b1cf27b9a

General

Target
2026-04-24_2657b25ad5500ad3ecdce43eff9dc0b8_elex_wannacry.exe
Size 37KB
Sample260424-lp951ae15j
SHA256 a2f4a2f6961282c4ae69397527567d9fcbb66a0cfd2d61d9f36ec42b1cf27b9a
MD5 2657b25ad5500ad3ecdce43eff9dc0b8
SHA1 a0c3d700e5b68ef0be0f73f83b70fa22ad138724
SHA512 de9590a142d146fd69b5bd91b78d0d9d8d06aafe3ab348ee992edf5dcb5d6bfcb830cc1c081a9c3ebcebdadde3eab46910fc2ac871efd94b4bf1a27b416dfa07
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywat:3LsF2Kerc64sTiX2IV0DhuogwK
TLSH
T1F5035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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
behavioral1/memory/4232-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000d000000024299-5.dat	family_juko
behavioral1/memory/4232-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4744-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000900000002448f-15.dat	family_juko
behavioral1/memory/868-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/868-18-0x0000000000400000-0x000000000041D000-memory.dmp	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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-04-24_2657b25ad5500ad3ecdce43eff9dc0b8_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4744	WINWORD.exe
868	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-1-5-21-312252282-3884318443-358092420-1000\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	2026-04-24_2657b25ad5500ad3ecdce43eff9dc0b8_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4964	cmd.exe
1596	PING.EXE
3608	PING.EXE
4476	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1596	PING.EXE
3608	PING.EXE
4476	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4232 wrote to memory of 4744	4232	2026-04-24_2657b25ad5500ad3ecdce43eff9dc0b8_elex_wannacry.exe	83
PID 4744 wrote to memory of 4964	4744	WINWORD.exe	84
PID 4964 wrote to memory of 1596	4964	cmd.exe	86
PID 4964 wrote to memory of 3608	4964	cmd.exe	87
PID 4964 wrote to memory of 4476	4964	cmd.exe	88
PID 4964 wrote to memory of 868	4964	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-04-24_2657b25ad5500ad3ecdce43eff9dc0b8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-24_2657b25ad5500ad3ecdce43eff9dc0b8_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4232
- 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:4744
- - 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\00005214" 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:4964
  - - 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:1596
  - - 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:3608
  - - 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:4476
  - - 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:868

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

00005214

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005214
Size 37KB
SHA256 f53498aa14930b92c3a521b845974f7e91d96b1b7b0dfa6934e9ff3fbfc45100
MD5 183f23a99948add95b4cd8ca4fe47ac3
SHA1 495ffb367a7e41fc3512df41c803bac69f6b8a7e
SHA512 ad6c4ad0ba1e425126b570a6fe0fce8d0b9fac230cb76603c06737e12c3f7fad7091b0b1759d289b4f8778872729acb54d5204e458740e48a7fe9deda9354443
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaA:3LsF2Kerc64sTiX2IV0Dhuogw/
TLSH
T1D2035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 a2f4a2f6961282c4ae69397527567d9fcbb66a0cfd2d61d9f36ec42b1cf27b9a
MD5 2657b25ad5500ad3ecdce43eff9dc0b8
SHA1 a0c3d700e5b68ef0be0f73f83b70fa22ad138724
SHA512 de9590a142d146fd69b5bd91b78d0d9d8d06aafe3ab348ee992edf5dcb5d6bfcb830cc1c081a9c3ebcebdadde3eab46910fc2ac871efd94b4bf1a27b416dfa07
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywat:3LsF2Kerc64sTiX2IV0DhuogwK
TLSH
T1F5035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/868-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/868-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4232-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4232-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4744-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads