juko | f07bda90a187316738fcf6556da81dd6a7b77e6356ee3bb4e16adb6b3fa79861

General

Target
2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe
Size 49KB
Sample260419-mdwznsc16w
SHA256 f07bda90a187316738fcf6556da81dd6a7b77e6356ee3bb4e16adb6b3fa79861
MD5 227cfc8dae2535c109e05614657637c0
SHA1 05c9669e5f18e4a06d78e3f3ab48d9f22d9f0d51
SHA512 29ee83dc38e848e90594e69f4ce02a5e01fcdf62f13c704fe40be1e014249bda52ffc482342c6980147f12f4a7a620d6a09f1c03f5ed57287b6d88f7343addb8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2k:VLy2Kerc64CiGImVu8p4kojWh2k
TLSH
T17B334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3748-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x009900000001b598-5.dat	family_juko
behavioral1/memory/3748-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3016-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024341-15.dat	family_juko
behavioral1/memory/2336-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2336-19-0x0000000000400000-0x0000000000420000-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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3016	WINWORD.exe
2336	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-1-5-21-2714754311-527593155-1440850301-1000\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	2026-04-19_227cfc8dae2535c109e05614657637c0_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
3392	cmd.exe
1604	PING.EXE
2700	PING.EXE
3108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1604	PING.EXE
2700	PING.EXE
3108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3748 wrote to memory of 3016	3748	2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe	84
PID 3016 wrote to memory of 3392	3016	WINWORD.exe	85
PID 3392 wrote to memory of 1604	3392	cmd.exe	87
PID 3392 wrote to memory of 2700	3392	cmd.exe	88
PID 3392 wrote to memory of 3108	3392	cmd.exe	89
PID 3392 wrote to memory of 2336	3392	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3748
- 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:3016
- - 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\00006B63" 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: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:1604
  - - 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:2700
  - - 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:2336

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

00006B63

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006B63
Size 49KB
SHA256 aeb3aaa5c188eac492970be7ff7a4c1dd888c1fc3609fbbc2d00d30eae683da8
MD5 4c477514cebff88bb626339b9044676a
SHA1 96ff7eb8ac069b9272e5f03f0909ec6d7160dd2a
SHA512 100904bbe39510c5734c9c193030d652e0436c190e95c88ae346caa7ae19a0e1da4880ffc12640e3762b79371a733f1c5c93d753f72d5d242f229948bb8db735
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2a:VLy2Kerc64CiGImVu8p4kojWh2a
TLSH
T123334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 f07bda90a187316738fcf6556da81dd6a7b77e6356ee3bb4e16adb6b3fa79861
MD5 227cfc8dae2535c109e05614657637c0
SHA1 05c9669e5f18e4a06d78e3f3ab48d9f22d9f0d51
SHA512 29ee83dc38e848e90594e69f4ce02a5e01fcdf62f13c704fe40be1e014249bda52ffc482342c6980147f12f4a7a620d6a09f1c03f5ed57287b6d88f7343addb8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2k:VLy2Kerc64CiGImVu8p4kojWh2k
TLSH
T17B334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2336-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2336-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2336-18-0x0000000002F40000-0x0000000002F59000-memory.dmp

Download

memory/3016-14-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3748-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3748-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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