juko | 382b0c552457a0c1e2842bf815f3e903ac7849185266e9bd548bc5d4d45d06bc

General

Target
2026-07-20_3474a2a46f69694a6fe1f45377e8c5ad_elex_wannacry.exe
Size 64KB
Sample260720-1682lahx8x
SHA256 382b0c552457a0c1e2842bf815f3e903ac7849185266e9bd548bc5d4d45d06bc
MD5 3474a2a46f69694a6fe1f45377e8c5ad
SHA1 96398e8fdbe8315fbf5568d09e9d3817225d20d1
SHA512 59eeb0ac68c27f28684dbbf6998d1dee588b36524cbdadf30d6f9c4e7c60a2a4ee4bb12700715a7cd8a019500db0dbd42b3665ac1b3f13a5bd384df87ffeb849
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uY:sLy2Kerc64CiGIm8so28Y
TLSH
T1CA535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x0008000000016b3a-4.dat	family_juko
behavioral2/files/0x000f00000001c4f2-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3260	WINWORD.exe
1632	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-1-5-21-2301830172-776172150-2531349243-1000\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
5504	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	2026-07-20_3474a2a46f69694a6fe1f45377e8c5ad_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
5504	cmd.exe
4372	PING.EXE
468	PING.EXE
4100	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4372	PING.EXE
468	PING.EXE
4100	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2292 wrote to memory of 3260	2292	2026-07-20_3474a2a46f69694a6fe1f45377e8c5ad_elex_wannacry.exe	89
PID 3260 wrote to memory of 5504	3260	WINWORD.exe	90
PID 5504 wrote to memory of 4372	5504	cmd.exe	92
PID 5504 wrote to memory of 468	5504	cmd.exe	93
PID 5504 wrote to memory of 4100	5504	cmd.exe	94
PID 5504 wrote to memory of 1632	5504	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-20_3474a2a46f69694a6fe1f45377e8c5ad_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_3474a2a46f69694a6fe1f45377e8c5ad_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2292
- 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:3260
- - 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\00000DB5" 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:5504
  - - 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:4372
  - - 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:468
  - - 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:4100
  - - 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:1632

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

00000DB5

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000DB5
Size 64KB
SHA256 2aea6c8e583bf4db6d4ebc73ad99d18fe02998fc19e95f090eb60e7c69f2b048
MD5 468f77e2ca5c7907eef0bef6f33ea869
SHA1 43a86eb6060b95aa68cfc987c4f64da68c556ba1
SHA512 916f899fbdec81a5f61d1f579d4d68da9a8fac781b24838f6d84d13094be30693e02ec675788ae4ad511dc4042ac15ed84b8394b5f31203fff573716ea506ccd
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u1:sLy2Kerc64CiGIm8so281
TLSH
T12C535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 382b0c552457a0c1e2842bf815f3e903ac7849185266e9bd548bc5d4d45d06bc
MD5 3474a2a46f69694a6fe1f45377e8c5ad
SHA1 96398e8fdbe8315fbf5568d09e9d3817225d20d1
SHA512 59eeb0ac68c27f28684dbbf6998d1dee588b36524cbdadf30d6f9c4e7c60a2a4ee4bb12700715a7cd8a019500db0dbd42b3665ac1b3f13a5bd384df87ffeb849
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uY:sLy2Kerc64CiGIm8so28Y
TLSH
T1CA535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads