juko | dc3628241d4353bffd2fa2c03f529d31dd1125c6142391ccf002b248d48df0ef

General

Target
2026-04-15_1331597d49e77c820284dd98c6afaf8d_elex_wannacry.exe
Size 86KB
Sample260415-rjfxvsbt91
SHA256 dc3628241d4353bffd2fa2c03f529d31dd1125c6142391ccf002b248d48df0ef
MD5 1331597d49e77c820284dd98c6afaf8d
SHA1 1aa5f2f371a58eeaac9365a51b1901eb9f4455c2
SHA512 e9d2adfcf166066e977469a537af588d42b745c8d99edd2afad576c2a3f25033ca5f4991ed460f2d138109e8788413ff36aeb266238050157e7feefa0d8effa2
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp/:vLy2Kerc64CiGImMPu/ouEQkwp/
TLSH
T19B83C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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/1424-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b0f5-5.dat	family_juko
behavioral2/memory/3704-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1424-13-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3704-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b32b-16.dat	family_juko
behavioral2/memory/2564-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2564-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3704	WINWORD.exe
2564	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-1-5-21-3847269522-1618051987-1942096715-1000\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	2026-04-15_1331597d49e77c820284dd98c6afaf8d_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
3336	cmd.exe
2108	PING.EXE
1184	PING.EXE
2416	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2108	PING.EXE
1184	PING.EXE
2416	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1424 wrote to memory of 3704	1424	2026-04-15_1331597d49e77c820284dd98c6afaf8d_elex_wannacry.exe	80
PID 3704 wrote to memory of 3336	3704	WINWORD.exe	81
PID 3336 wrote to memory of 2108	3336	cmd.exe	83
PID 3336 wrote to memory of 1184	3336	cmd.exe	84
PID 3336 wrote to memory of 2416	3336	cmd.exe	85
PID 3336 wrote to memory of 2564	3336	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-15_1331597d49e77c820284dd98c6afaf8d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_1331597d49e77c820284dd98c6afaf8d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1424
- 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:3704
- - 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\0000261B" 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:3336
  - - 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:2108
  - - 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:1184
  - - 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:2416
  - - 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:2564

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

0000261B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000261B
Size 86KB
SHA256 f540273629605ebf19e18b633a919f6afea0be8bbe839ae27418dbf857c00353
MD5 fe465edd22aca58a31abf8a524de7c31
SHA1 f695b65992f0537834ecf5d4322faebc05750a85
SHA512 8bc255da98664a609b7f4ca4a578430286a129b7ffbd90920a1fe1e9ec11b40650ba7d8257ec57a9adf6dd08d8ebcf361d387a18e7f0fde55b550c1c4155a0de
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpT:vLy2Kerc64CiGImMPu/ouEQkwpT
TLSH
T1A083C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 dc3628241d4353bffd2fa2c03f529d31dd1125c6142391ccf002b248d48df0ef
MD5 1331597d49e77c820284dd98c6afaf8d
SHA1 1aa5f2f371a58eeaac9365a51b1901eb9f4455c2
SHA512 e9d2adfcf166066e977469a537af588d42b745c8d99edd2afad576c2a3f25033ca5f4991ed460f2d138109e8788413ff36aeb266238050157e7feefa0d8effa2
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp/:vLy2Kerc64CiGImMPu/ouEQkwp/
TLSH
T19B83C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1424-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1424-13-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2564-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2564-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3704-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3704-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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