juko | be527a74f5c84689570fcc3af3dcf4b5d9ba26c6a8f10c1410e8451cdccba4cf

General

Target
2026-07-21_2609ca9be1c936e5d97e665b32c8b789_elex_wannacry.exe
Size 39KB
Sample260721-2flztavenh
SHA256 be527a74f5c84689570fcc3af3dcf4b5d9ba26c6a8f10c1410e8451cdccba4cf
MD5 2609ca9be1c936e5d97e665b32c8b789
SHA1 1ae4aabb6ac9fe6376b16e384515e74a2e7edf21
SHA512 3fbbd2f98869633be075aaea51fbc3c8bad6434b4e82f50a054441ee9f00356c106618e64b563310e62d6cc9e9d6660cc2b0153bc1d5e0d1e093e99b8daa8c79
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBw:aLsF2Kerc64sTiX2IV0DVyIGFz
TLSH
T15E036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2056-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000006910-5.dat	family_juko
behavioral2/memory/2056-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1204-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000500000001b6f1-13.dat	family_juko
behavioral2/memory/2744-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2744-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1204	WINWORD.exe
2744	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-1-5-21-189034102-168398478-1159367937-1000\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
3968	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-21_2609ca9be1c936e5d97e665b32c8b789_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

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
4112	PING.EXE
4548	PING.EXE
4968	PING.EXE
3968	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4112	PING.EXE
4548	PING.EXE
4968	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2056 wrote to memory of 1204	2056	2026-07-21_2609ca9be1c936e5d97e665b32c8b789_elex_wannacry.exe	89
PID 1204 wrote to memory of 3968	1204	WINWORD.exe	90
PID 3968 wrote to memory of 4112	3968	cmd.exe	92
PID 3968 wrote to memory of 4548	3968	cmd.exe	93
PID 3968 wrote to memory of 4968	3968	cmd.exe	94
PID 3968 wrote to memory of 2744	3968	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-21_2609ca9be1c936e5d97e665b32c8b789_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-21_2609ca9be1c936e5d97e665b32c8b789_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2056
- 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:1204
- - 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\00001063" 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:3968
  - - 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:4112
  - - 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:4548
  - - 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:4968
  - - 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:2744

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:2384

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

00001063

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001063
Size 39KB
SHA256 9239b4df78fa5efa5a73654086b9bf13e7c863bf4990f6baa265240b140721c4
MD5 1c45efccfa033f9bbeafac0920ddfee3
SHA1 15dec9de0e8f31194ebc6a926da9cd43540dcc18
SHA512 28d1388a8acf3ce3a757723a03d4c0ecb918d583ecb89dc604521872a43d7b7b2047bba628e252cf8f6fa72313e403a5d080e816d5af27aebf3893e6b0da5ca3
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBX:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T1A8036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 be527a74f5c84689570fcc3af3dcf4b5d9ba26c6a8f10c1410e8451cdccba4cf
MD5 2609ca9be1c936e5d97e665b32c8b789
SHA1 1ae4aabb6ac9fe6376b16e384515e74a2e7edf21
SHA512 3fbbd2f98869633be075aaea51fbc3c8bad6434b4e82f50a054441ee9f00356c106618e64b563310e62d6cc9e9d6660cc2b0153bc1d5e0d1e093e99b8daa8c79
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBw:aLsF2Kerc64sTiX2IV0DVyIGFz
TLSH
T15E036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1204-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2056-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2056-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2744-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2744-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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