juko | a1085db1ec3a81caa0c5967e786ba3c582d0dd41d0661b05c4916a9763136901

General

Target
2026-09-21_b89d0513cdf24a717d9d61a7016e05d1_elex_wannacry.exe
Size 151KB
Sample260922-mlsl8acb46
SHA256 a1085db1ec3a81caa0c5967e786ba3c582d0dd41d0661b05c4916a9763136901
MD5 b89d0513cdf24a717d9d61a7016e05d1
SHA1 212a2cb6699f01ff79f6f124e5124fccb7bf8800
SHA512 f55a8e330c442296ead4fa7eeb083a0e4597bb7762cc144125f534542b0e28942dd4533ed88b870f49d9644e3621c2134d4dacd3249211817299a34a455df0c4
SSDEEP 3072:LLy2Kerc64CiGIm6CjPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq9BMUOw:LLy2Kwc64YIridmrNPyEe2Xd/EPYQsOw
TLSH
T18DE36C06A14780F2DC6700B06689ABFF8A359E358421D9E6E798FC5DED739D1A72C307
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 6 IoCs

resource	yara_rule
behavioral2/memory/5960-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000c00000001b2c5-5.dat	family_juko
behavioral2/memory/5960-10-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/2096-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c464-13.dat	family_juko
behavioral2/memory/2636-15-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2096	WINWORD.exe
2636	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-1-5-21-4154726816-2055034831-2297277433-1000\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
2336	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	2026-09-21_b89d0513cdf24a717d9d61a7016e05d1_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
3356	PING.EXE
2336	cmd.exe
4612	PING.EXE
3008	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3356	PING.EXE
4612	PING.EXE
3008	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5960 wrote to memory of 2096	5960	2026-09-21_b89d0513cdf24a717d9d61a7016e05d1_elex_wannacry.exe	89
PID 2096 wrote to memory of 2336	2096	WINWORD.exe	90
PID 2336 wrote to memory of 4612	2336	cmd.exe	92
PID 2336 wrote to memory of 3008	2336	cmd.exe	93
PID 2336 wrote to memory of 3356	2336	cmd.exe	94
PID 2336 wrote to memory of 2636	2336	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-21_b89d0513cdf24a717d9d61a7016e05d1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-21_b89d0513cdf24a717d9d61a7016e05d1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5960
- 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:2096
- - 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\000051D5" 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:2336
  - - 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:4612
  - - 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:3008
  - - 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:3356
  - - 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:2636

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

000051D5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000051D5
Size 151KB
SHA256 c2712a0f99cbf1756ef3e3d84295de1bbac8fd299824f15395c4db816c870f23
MD5 0a7f136f0d16d73211f8fbe51ab15511
SHA1 2860ea4a46a2c1af75c3809842b116e8b55da0c9
SHA512 8c66be6d9fb5e1b05e93a346d388a3e2b194e9614227aef89bbbc9a772b43fa9142b0304c90dc409e0a08612e50c3dd846ec5312e23afcfeced8f65de390d6e1
SSDEEP 3072:LLy2Kerc64CiGIm6CjPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq9BMUOQ:LLy2Kwc64YIridmrNPyEe2Xd/EPYQsOQ
TLSH
T10EE36C06A14780F2DC6700B06689ABFF8A359E358421D9E6E798FC5DED739D1A72C307
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 151KB
SHA256 a1085db1ec3a81caa0c5967e786ba3c582d0dd41d0661b05c4916a9763136901
MD5 b89d0513cdf24a717d9d61a7016e05d1
SHA1 212a2cb6699f01ff79f6f124e5124fccb7bf8800
SHA512 f55a8e330c442296ead4fa7eeb083a0e4597bb7762cc144125f534542b0e28942dd4533ed88b870f49d9644e3621c2134d4dacd3249211817299a34a455df0c4
SSDEEP 3072:LLy2Kerc64CiGIm6CjPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq9BMUOw:LLy2Kwc64YIridmrNPyEe2Xd/EPYQsOw
TLSH
T18DE36C06A14780F2DC6700B06689ABFF8A359E358421D9E6E798FC5DED739D1A72C307
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2096-12-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/2636-15-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5960-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5960-10-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads