juko | c1910d63f0cca38e9ffa56e0554f994fea1194ea99f77ba6191940b128433614

General

Target
2026-08-19_973ceaf076b0dd8ce238e8b9395e54d4_elex_wannacry.exe
Size 64KB
Sample260820-adjm5awenh
SHA256 c1910d63f0cca38e9ffa56e0554f994fea1194ea99f77ba6191940b128433614
MD5 973ceaf076b0dd8ce238e8b9395e54d4
SHA1 40556ae9b0455682341654a77e9608908ab78b8d
SHA512 215fb695bb04bd35e24a6c0d96ebd045a82925f97b7d1c8635c399e1eca5cde160a08a28bda2f306a4ced2fe39e6f3568afdb4618762d54fb6c8438cbaeb2c7f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1B9535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000b00000001b85c-4.dat	family_juko
behavioral2/files/0x000d00000001c53d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2708	WINWORD.exe
5092	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-1-5-21-3611646547-550105268-947503007-1000\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
1828	cmd.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-19_973ceaf076b0dd8ce238e8b9395e54d4_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

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
1828	cmd.exe
3468	PING.EXE
1564	PING.EXE
4872	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1564	PING.EXE
4872	PING.EXE
3468	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2716 wrote to memory of 2708	2716	2026-08-19_973ceaf076b0dd8ce238e8b9395e54d4_elex_wannacry.exe	89
PID 2708 wrote to memory of 1828	2708	WINWORD.exe	90
PID 1828 wrote to memory of 3468	1828	cmd.exe	92
PID 1828 wrote to memory of 1564	1828	cmd.exe	93
PID 1828 wrote to memory of 4872	1828	cmd.exe	94
PID 1828 wrote to memory of 5092	1828	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-19_973ceaf076b0dd8ce238e8b9395e54d4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_973ceaf076b0dd8ce238e8b9395e54d4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2716
- 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:2708
- - 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\00003BF3" 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:1828
  - - 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:3468
  - - 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:1564
  - - 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:4872
  - - 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:5092

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003BF3

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003BF3
Size 64KB
SHA256 eb82e57d25c14c24e8869a09cc3ba8dd3381faf4322f1c60b82d7e10f436f2d3
MD5 c42b72d1f51d59d074ee0e7e8c1a19b4
SHA1 a92389d0e3a04731e2a3bfeb93dcedb03485b6e8
SHA512 daa7fcf530720360d4387e59feb49879747d16407f442a5a7e5a5d98f74e09d0d0112d0b584794b4cb61b8dfbf2e68d5dd3daae1350f5b365de03528672fa19a
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uQ:sLy2Kerc64CiGIm8so28Q
TLSH
T100535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 c1910d63f0cca38e9ffa56e0554f994fea1194ea99f77ba6191940b128433614
MD5 973ceaf076b0dd8ce238e8b9395e54d4
SHA1 40556ae9b0455682341654a77e9608908ab78b8d
SHA512 215fb695bb04bd35e24a6c0d96ebd045a82925f97b7d1c8635c399e1eca5cde160a08a28bda2f306a4ced2fe39e6f3568afdb4618762d54fb6c8438cbaeb2c7f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1B9535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads