juko | f3458eea402e044efe60a7a7c5d8e4b15d193aecb6cafbb216275115c0c4ddd1

General

Target
2026-07-04_103bc2babbf88a15c5514f857171d5fb_elex_wannacry.exe
Size 30KB
Sample260704-e2qhssa16w
SHA256 f3458eea402e044efe60a7a7c5d8e4b15d193aecb6cafbb216275115c0c4ddd1
MD5 103bc2babbf88a15c5514f857171d5fb
SHA1 ccb4b09f6ea8e86e091900bf2e36737162e68dd7
SHA512 c4af70e0d36815c088cac0b7546eef42fae586c8e18149042e11b6c850d5e24d0da52e8ed3de7d44adec8f52559e1d1b8af83c475f2e26739340f73ae3618c0c
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXM:tLsF2Kerc64sTiX2IV0DzloM
TLSH
T1D8E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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 2 IoCs

resource	yara_rule
behavioral1/files/0x00100000000231f3-4.dat	family_juko
behavioral1/files/0x0008000000024680-9.dat	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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-07-04_103bc2babbf88a15c5514f857171d5fb_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5548	WINWORD.exe
5540	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-1-5-21-3053180483-1881419501-3594244048-1000\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	2026-07-04_103bc2babbf88a15c5514f857171d5fb_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
3284	PING.EXE
3196	PING.EXE
1060	PING.EXE
4456	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1060	PING.EXE
3284	PING.EXE
3196	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4716 wrote to memory of 5548	4716	2026-07-04_103bc2babbf88a15c5514f857171d5fb_elex_wannacry.exe	86
PID 5548 wrote to memory of 4456	5548	WINWORD.exe	87
PID 4456 wrote to memory of 3284	4456	cmd.exe	89
PID 4456 wrote to memory of 3196	4456	cmd.exe	90
PID 4456 wrote to memory of 1060	4456	cmd.exe	91
PID 4456 wrote to memory of 5540	4456	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-07-04_103bc2babbf88a15c5514f857171d5fb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-04_103bc2babbf88a15c5514f857171d5fb_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4716
- 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:5548
- - 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\00002D7A" 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:4456
  - - 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:3284
  - - 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:3196
  - - 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:1060
  - - 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:5540

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

00002D7A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002D7A
Size 30KB
SHA256 2493f43aa86977a84a785193f0801eee3cc7011dea43d1aa5b767b05bce585ca
MD5 a4f6ab92ab0d7719f917358c7a2a5af1
SHA1 07121a572a32413c59230c852824cb7c093c8460
SHA512 80b8853ca6d860cf4278ec769a3c9ceff6bdd7dc9741b488e4d2ad8f3db621bd83fa83650c163d83c46306b6862fe9f35686b4431f297c145c2a546aed1245ab
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXA:tLsF2Kerc64sTiX2IV0DzloA
TLSH
T107E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 f3458eea402e044efe60a7a7c5d8e4b15d193aecb6cafbb216275115c0c4ddd1
MD5 103bc2babbf88a15c5514f857171d5fb
SHA1 ccb4b09f6ea8e86e091900bf2e36737162e68dd7
SHA512 c4af70e0d36815c088cac0b7546eef42fae586c8e18149042e11b6c850d5e24d0da52e8ed3de7d44adec8f52559e1d1b8af83c475f2e26739340f73ae3618c0c
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXM:tLsF2Kerc64sTiX2IV0DzloM
TLSH
T1D8E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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