juko | 7fa3601e2037241f4b55e404bfaefe3191e292a8226aa6882d6ef6300b375de5

General

Target
2026-05-03_49224d274c60e932222acf22407f37a9_elex_wannacry.exe
Size 57KB
Sample260503-hal8vags2p
SHA256 7fa3601e2037241f4b55e404bfaefe3191e292a8226aa6882d6ef6300b375de5
MD5 49224d274c60e932222acf22407f37a9
SHA1 8b350b76058925e7cd9bd4b0bad102e15b436065
SHA512 9f760809cfcd7d1096a6d032c7fe3048e948ef0a51737b9be357042b66f4c0eb09aea30166e1a8ef7cec2f8a2acdc6c5763e999baa1a43c1c45f3c389e138cae
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQP:qLy2Kerc64CiGImklNUyp8Ts
TLSH
T182433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/4604-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000a000000024324-5.dat	family_juko
behavioral1/memory/4604-13-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/5068-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/files/0x000400000001e6a9-15.dat	family_juko
behavioral1/memory/4316-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral1/memory/4316-18-0x0000000000400000-0x0000000000422000-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-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-05-03_49224d274c60e932222acf22407f37a9_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5068	WINWORD.exe
4316	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-1-5-21-721190819-434563495-2007910846-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-03_49224d274c60e932222acf22407f37a9_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

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
5008	cmd.exe
5572	PING.EXE
2584	PING.EXE
4456	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5572	PING.EXE
2584	PING.EXE
4456	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4604 wrote to memory of 5068	4604	2026-05-03_49224d274c60e932222acf22407f37a9_elex_wannacry.exe	85
PID 5068 wrote to memory of 5008	5068	WINWORD.exe	86
PID 5008 wrote to memory of 5572	5008	cmd.exe	88
PID 5008 wrote to memory of 2584	5008	cmd.exe	89
PID 5008 wrote to memory of 4456	5008	cmd.exe	90
PID 5008 wrote to memory of 4316	5008	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-05-03_49224d274c60e932222acf22407f37a9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-03_49224d274c60e932222acf22407f37a9_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4604
- 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:5068
- - 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\00004529" 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:5008
  - - 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:5572
  - - 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:2584
  - - 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:4456
  - - 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:4316

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

00004529

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004529
Size 57KB
SHA256 7b9bc2402cc98dca199d199089a13badad195ba2d206114898747722041cefe0
MD5 fd505927526e3b13dea2f6dc8381ed45
SHA1 91563f4fbee8efe8a315dec18b0e301820412bf5
SHA512 6604e3bcef2d5ade646bf0b15d9b070c1790feff727233024b4502ea2adaa5c8dc01628e80027e4e1f30bef947db7a1e0ab36300aa73de018bdbc1c4733bf19c
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQ+:qLy2Kerc64CiGImklNUyp8T1
TLSH
T125433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 7fa3601e2037241f4b55e404bfaefe3191e292a8226aa6882d6ef6300b375de5
MD5 49224d274c60e932222acf22407f37a9
SHA1 8b350b76058925e7cd9bd4b0bad102e15b436065
SHA512 9f760809cfcd7d1096a6d032c7fe3048e948ef0a51737b9be357042b66f4c0eb09aea30166e1a8ef7cec2f8a2acdc6c5763e999baa1a43c1c45f3c389e138cae
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQP:qLy2Kerc64CiGImklNUyp8Ts
TLSH
T182433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4316-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4316-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4604-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4604-13-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5068-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads