juko | 7abeaa47ba6d6168a062956bd622755476488f824d4a92a554b4cd5139ec2c2e

General

Target
2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe
Size 39KB
Sample260731-pc72naac24
SHA256 7abeaa47ba6d6168a062956bd622755476488f824d4a92a554b4cd5139ec2c2e
MD5 2e3ce0130b6f4d9d5132f81c28530bd3
SHA1 dd3e26ec9215d44ab9c510816cf436095d36ebe1
SHA512 ccc6345fec78c83ca7b52d55991ac0d43cf32074ddd0788c87f925f129519d2155bb0171d01a87c11f038afcdbaa6e13054195c97e41fc1def819b702465698c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB7:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T1CC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 8 IoCs

resource	yara_rule
behavioral2/memory/2260-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0009000000016b4d-5.dat	family_juko
behavioral2/memory/4540-11-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2260-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4540-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c49e-14.dat	family_juko
behavioral2/memory/4544-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4544-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4540	WINWORD.exe
4544	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-1-5-21-552508041-2681165170-3229858294-1000\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
4248	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	2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_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
4248	cmd.exe
5572	PING.EXE
440	PING.EXE
2896	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2896	PING.EXE
5572	PING.EXE
440	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2260 wrote to memory of 4540	2260	2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe	89
PID 4540 wrote to memory of 4248	4540	WINWORD.exe	90
PID 4248 wrote to memory of 5572	4248	cmd.exe	92
PID 4248 wrote to memory of 440	4248	cmd.exe	93
PID 4248 wrote to memory of 2896	4248	cmd.exe	94
PID 4248 wrote to memory of 4544	4248	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2260
- 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:4540
- - 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\000048AD" 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:4248
  - - 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:5572
  - - 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:440
  - - 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:2896
  - - 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:4544

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

000048AD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000048AD
Size 39KB
SHA256 3e88d57bdb6d1678ef731813d7eb538cf789de96d9b67a95967762fdfeb877f7
MD5 8a286b89dd66057f9a512b757f4f4433
SHA1 8cc83196b9c15e91174721072c2af692a0b43a75
SHA512 5fb0fbe4f9e97ea9f6311647de101859a9f8f30ad2cbbfe987abdc56a484fc31967aae011f8682cb264869d275aa7f308e8259f3af6d499f7616a9507c56cdc4
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB5:aLsF2Kerc64sTiX2IV0DVyIGFG
TLSH
T1D1036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 7abeaa47ba6d6168a062956bd622755476488f824d4a92a554b4cd5139ec2c2e
MD5 2e3ce0130b6f4d9d5132f81c28530bd3
SHA1 dd3e26ec9215d44ab9c510816cf436095d36ebe1
SHA512 ccc6345fec78c83ca7b52d55991ac0d43cf32074ddd0788c87f925f129519d2155bb0171d01a87c11f038afcdbaa6e13054195c97e41fc1def819b702465698c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB7:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T1CC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2260-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2260-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4540-11-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4540-13-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4544-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4544-17-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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