juko | c91eabfd87eacca0487c9675f84bbf32eff5257221ac97ba3f7dd65f46d5861a

General

Target
2026-10-19_420cd4d2c323734bb06b0834b1cdf8e3_elex_wannacry.exe
Size 90KB
Sample261020-187ljsdd95
SHA256 c91eabfd87eacca0487c9675f84bbf32eff5257221ac97ba3f7dd65f46d5861a
MD5 420cd4d2c323734bb06b0834b1cdf8e3
SHA1 f692edc893994309b168acd144dc03208c66a4e8
SHA512 42508d2813395eeb1a58b86922a5647d4032de289958cb5537106f6966c581858d6e68c93e3dfe482406ff427620dfbe8480a04f5e9ed0bac1edda45cbe5a019
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/c:vLy2Kerc64CiGImVuX/N81rRLoPtU+3u
TLSH
T19C933A1BF18A279CF6178274DAAA5A70A0BD7CB44533FC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/1832-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000a000000019cb3-4.dat	family_juko
behavioral2/memory/5040-9-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/1832-11-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/5040-13-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c652-14.dat	family_juko
behavioral2/memory/3064-17-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5040	WINWORD.exe
3064	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-1-5-21-53044966-3830981193-2402648431-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5396	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.exe

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	2026-10-19_420cd4d2c323734bb06b0834b1cdf8e3_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
5396	cmd.exe
5840	PING.EXE
1076	PING.EXE
5684	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5840	PING.EXE
1076	PING.EXE
5684	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1832 wrote to memory of 5040	1832	2026-10-19_420cd4d2c323734bb06b0834b1cdf8e3_elex_wannacry.exe	89
PID 5040 wrote to memory of 5396	5040	WINWORD.exe	90
PID 5396 wrote to memory of 5840	5396	cmd.exe	92
PID 5396 wrote to memory of 1076	5396	cmd.exe	93
PID 5396 wrote to memory of 5684	5396	cmd.exe	94
PID 5396 wrote to memory of 3064	5396	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-19_420cd4d2c323734bb06b0834b1cdf8e3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-19_420cd4d2c323734bb06b0834b1cdf8e3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1832
- 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:5040
- - 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\00003343" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5396
  - - 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:5840
  - - 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:1076
  - - 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:5684
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:3064

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:5868

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003343

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003343
Size 90KB
SHA256 d419cff51bc3ddf437924507808016eb0dfc05776d9c3bf35580b170850fd4a4
MD5 98fb66450f31a81e81d172e790188070
SHA1 7cd2c0e74b771372ed20ab509f6010f84d663a99
SHA512 24d6e25f05634f25d240b12150d5f08c8d4de74d750179a769c123abffb9128fa22814bdb671986144271ef1c33c2c5e4edae80b466e3f957c061157a7a5591d
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/w:vLy2Kerc64CiGImVuX/N81rRLoPtU+3q
TLSH
T137933A1BF18A279CF6178274DAAA5A70A0BD7CB44533BC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 90KB
SHA256 c91eabfd87eacca0487c9675f84bbf32eff5257221ac97ba3f7dd65f46d5861a
MD5 420cd4d2c323734bb06b0834b1cdf8e3
SHA1 f692edc893994309b168acd144dc03208c66a4e8
SHA512 42508d2813395eeb1a58b86922a5647d4032de289958cb5537106f6966c581858d6e68c93e3dfe482406ff427620dfbe8480a04f5e9ed0bac1edda45cbe5a019
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/c:vLy2Kerc64CiGImVuX/N81rRLoPtU+3u
TLSH
T19C933A1BF18A279CF6178274DAAA5A70A0BD7CB44533FC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1832-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/1832-11-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3064-17-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5040-9-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5040-13-0x0000000000400000-0x000000000041C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads