juko | 74eacc15f73002edfe9c4887392fe828c6e3c6734df00860d966cbc9032af4e7

General

Target
2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe
Size 57KB
Sample260517-s9blhaev2m
SHA256 74eacc15f73002edfe9c4887392fe828c6e3c6734df00860d966cbc9032af4e7
MD5 9c8034c93e8eea2215485b5bf9cb01bc
SHA1 6f976b02c513a94e7636136c1890d23ed78d2e70
SHA512 941ea4ef773af28b4af7d1edfcb5aeeff2ed0c259fd93387826c824c8c1fcc02049974d59dc3a452886f5f911cec2ff6a4a5045db4d88de8b739a41ecfef1993
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQO:qLy2Kerc64CiGImklNUyp8TB
TLSH
T19F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/2380-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x00180000000243b5-5.dat	family_juko
behavioral1/memory/2380-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4384-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000900000002436c-15.dat	family_juko
behavioral1/memory/2292-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/2292-18-0x0000000000400000-0x0000000000422000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4384	WINWORD.exe
2292	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-1-5-21-668679576-120646659-2289335452-1000\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	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_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.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
4044	cmd.exe
4088	PING.EXE
4836	PING.EXE
2324	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4088	PING.EXE
4836	PING.EXE
2324	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 4384	2380	2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe	88
PID 4384 wrote to memory of 4044	4384	WINWORD.exe	89
PID 4044 wrote to memory of 4088	4044	cmd.exe	91
PID 4044 wrote to memory of 4836	4044	cmd.exe	92
PID 4044 wrote to memory of 2324	4044	cmd.exe	93
PID 4044 wrote to memory of 2292	4044	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2380
- 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:4384
- - 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\00000C1D" 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:4044
  - - 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:4088
  - - 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:4836
  - - 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:2324
  - - 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:2292

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

00000C1D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000C1D
Size 57KB
SHA256 e314579f6c8e14c9bbb4417d39b23b9ab68385b137a6a104959c99cbbed8d170
MD5 fc6bf6732e7141f7ac22c625e7e0a98c
SHA1 f73ba1eaf3b76d866ed726ae424caadd1483105e
SHA512 3eb233b75b80a56c85e1ba93b5fe2a302838a399f0c3e96bdc7576638efbbef9c9ab5c33647ca364ca959f1a33e2b0d2362eaa64913bf913e986fd819b8d4819
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQ+:qLy2Kerc64CiGImklNUyp8T5
TLSH
T1CE433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 74eacc15f73002edfe9c4887392fe828c6e3c6734df00860d966cbc9032af4e7
MD5 9c8034c93e8eea2215485b5bf9cb01bc
SHA1 6f976b02c513a94e7636136c1890d23ed78d2e70
SHA512 941ea4ef773af28b4af7d1edfcb5aeeff2ed0c259fd93387826c824c8c1fcc02049974d59dc3a452886f5f911cec2ff6a4a5045db4d88de8b739a41ecfef1993
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQO:qLy2Kerc64CiGImklNUyp8TB
TLSH
T19F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2292-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2292-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2380-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2380-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4384-14-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads