juko | 986bb0981559aa59e486de93bcb74447c4710cd4e73e1ab80ff72f6034fbb58b

General

Target
2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe
Size 32KB
Sample260507-jcsdbacz6p
SHA256 986bb0981559aa59e486de93bcb74447c4710cd4e73e1ab80ff72f6034fbb58b
MD5 0f3ab04b53da569d5e546ec844a9a4c4
SHA1 e43ce80d1ef5cb43435a0cbab03eafdcbc5da3d2
SHA512 40fa786131170ac52b14748a166830f2bab8a9724916d6725f7dc0f0bc9c8d2f27f2692d139653276ec532f946ed3843093c22f5d16333032edc8e6459dc03f1
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXlP:cLsF2Kerc64sTiX2IV0DzY4kMZ
TLSH
T1F0E23B2B6AA17052C59320B0F9592F35C43D9CB9016BB062F7417B6928B2D63CF71ECE
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
behavioral2/files/0x000d0000000259a4-4.dat	family_juko
behavioral2/files/0x001b00000002b3cf-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4384	WINWORD.exe
3432	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-1-5-21-3119821332-640943685-2562343641-1000\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	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	2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.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
2036	cmd.exe
4392	PING.EXE
3252	PING.EXE
1068	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4392	PING.EXE
3252	PING.EXE
1068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 4384	3680	2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe	79
PID 4384 wrote to memory of 2036	4384	WINWORD.exe	80
PID 2036 wrote to memory of 4392	2036	cmd.exe	82
PID 2036 wrote to memory of 3252	2036	cmd.exe	83
PID 2036 wrote to memory of 1068	2036	cmd.exe	84
PID 2036 wrote to memory of 3432	2036	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3680
- 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:4384
- - 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\00001BF0" 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:2036
  - - 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:4392
  - - 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:3252
  - - 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:1068
  - - 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:3432

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

00001BF0

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001BF0
Size 32KB
SHA256 aa2312c6c9cec3617030e62eb569a9eb3b5806d7b563ec015a49c62da3038249
MD5 642f5690a7c734a7c2f94b61b7fd9b3a
SHA1 46de595625c6e301ffa7c86d6e82019b3bd69688
SHA512 06dcb40af3f7a577183140d5eb74673c11ce763aef6ee2d432126c607f40cba2431ca40d956891faf7549c599eee8294a29181a0a8819c51fdde310ba089faf8
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXlT:cLsF2Kerc64sTiX2IV0DzY4kMZ
TLSH
T1E1E23B2B6AA17052C59320B0F9592F35C43D9CB9016BB062F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 986bb0981559aa59e486de93bcb74447c4710cd4e73e1ab80ff72f6034fbb58b
MD5 0f3ab04b53da569d5e546ec844a9a4c4
SHA1 e43ce80d1ef5cb43435a0cbab03eafdcbc5da3d2
SHA512 40fa786131170ac52b14748a166830f2bab8a9724916d6725f7dc0f0bc9c8d2f27f2692d139653276ec532f946ed3843093c22f5d16333032edc8e6459dc03f1
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXlP:cLsF2Kerc64sTiX2IV0DzY4kMZ
TLSH
T1F0E23B2B6AA17052C59320B0F9592F35C43D9CB9016BB062F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3432-16-0x0000000000980000-0x00000000009FB000-memory.dmp

Download

memory/3680-11-0x0000000000870000-0x00000000008EB000-memory.dmp

Download

memory/4384-13-0x0000000000880000-0x00000000008FB000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads