juko | b1aad7a47c234b86de5ceb9bcc7ec5d6bfc257b9dff16c013b6f033ffdf74e3b

General

Target
2026-07-15_cb17f85456167f7faddc2b26ab5ece37_elex_wannacry.exe
Size 39KB
Sample260715-ngtjdset2s
SHA256 b1aad7a47c234b86de5ceb9bcc7ec5d6bfc257b9dff16c013b6f033ffdf74e3b
MD5 cb17f85456167f7faddc2b26ab5ece37
SHA1 7c40051b2347d075ff4910a1b027b667b04976be
SHA512 f2f0b938a1a0253094e0f98c37cf4f50d19a30b582ddf92cb7c3cc2bbf0ca134c063101c55d5bbd3ddfa999a099c0fb5961d622891c6cdf4bf28e5ad1cdd3ff8
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBI:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T142036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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
behavioral2/memory/4676-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85f-5.dat	family_juko
behavioral2/memory/4676-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4244-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c520-13.dat	family_juko
behavioral2/memory/2736-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2736-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4244	WINWORD.exe
2736	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-1-5-21-3797332335-34111092-3597280141-1000\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	2026-07-15_cb17f85456167f7faddc2b26ab5ece37_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
1120	cmd.exe
3572	PING.EXE
5084	PING.EXE
1012	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3572	PING.EXE
5084	PING.EXE
1012	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4676 wrote to memory of 4244	4676	2026-07-15_cb17f85456167f7faddc2b26ab5ece37_elex_wannacry.exe	88
PID 4244 wrote to memory of 1120	4244	WINWORD.exe	89
PID 1120 wrote to memory of 3572	1120	cmd.exe	91
PID 1120 wrote to memory of 5084	1120	cmd.exe	92
PID 1120 wrote to memory of 1012	1120	cmd.exe	93
PID 1120 wrote to memory of 2736	1120	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-15_cb17f85456167f7faddc2b26ab5ece37_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-15_cb17f85456167f7faddc2b26ab5ece37_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4676
- 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:4244
- - 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\00003816" 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:1120
  - - 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:3572
  - - 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:5084
  - - 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:1012
  - - 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:2736

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

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

00003816

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003816
Size 39KB
SHA256 445349e68d7978fccc2c21fa9df8e567e706cd975ea0d7c5e0b71d326709e321
MD5 2a9a92b4af63c7c1bdb2fc03bad45227
SHA1 1bbe1a8b6648b2380eeb03ae2394b7dfdd538e93
SHA512 d0373506518f220872188f6e3048bb0b53ee2e175c99d42a1e7550b761ebceae2b696d198d9988df6a09cf199cddc60b9a0100c4b1fafec321af8669bf776f52
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBQ:aLsF2Kerc64sTiX2IV0DVyIGFf
TLSH
T141036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 b1aad7a47c234b86de5ceb9bcc7ec5d6bfc257b9dff16c013b6f033ffdf74e3b
MD5 cb17f85456167f7faddc2b26ab5ece37
SHA1 7c40051b2347d075ff4910a1b027b667b04976be
SHA512 f2f0b938a1a0253094e0f98c37cf4f50d19a30b582ddf92cb7c3cc2bbf0ca134c063101c55d5bbd3ddfa999a099c0fb5961d622891c6cdf4bf28e5ad1cdd3ff8
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBI:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T142036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2736-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2736-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4244-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4676-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4676-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads