juko | 7705289b02c77ab400aa973a7a7f62e1e89d9050a243d6be9ea15b837b59ec9e

General

Target
2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe
Size 37KB
Sample260808-kpr4raw1ht
SHA256 7705289b02c77ab400aa973a7a7f62e1e89d9050a243d6be9ea15b837b59ec9e
MD5 ab09556ee3483725df178fef22456986
SHA1 de3b1090011f1ed71706b5bb53d800540e91f687
SHA512 d9dc12248ff737b76941c7d2fe6323d08dc3c46ceb5a9accd1aaede42f34a9192ced69801ce13cd2e26ea5b58394e113cf97e991e33fcc13210a47c3e10cbc92
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywax:3LsF2Kerc64sTiX2IV0DhuogwK
TLSH
T111035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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
behavioral1/memory/2544-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0017000000024300-5.dat	family_juko
behavioral1/memory/2544-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1124-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000b0000000243dd-15.dat	family_juko
behavioral1/memory/4524-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4524-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
1124	WINWORD.exe
4524	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-1-5-21-876885714-46325919-1482798410-1000\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
1604	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	2026-08-08_ab09556ee3483725df178fef22456986_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
1604	cmd.exe
4392	PING.EXE
4820	PING.EXE
2084	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4392	PING.EXE
4820	PING.EXE
2084	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2544 wrote to memory of 1124	2544	2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe	86
PID 1124 wrote to memory of 1604	1124	WINWORD.exe	87
PID 1604 wrote to memory of 4392	1604	cmd.exe	89
PID 1604 wrote to memory of 4820	1604	cmd.exe	92
PID 1604 wrote to memory of 2084	1604	cmd.exe	94
PID 1604 wrote to memory of 4524	1604	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2544
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1124
- - 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\00005CD8" 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:1604
  - - 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:4820
  - - 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:2084
  - - 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:4524

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00005CD8

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005CD8
Size 37KB
SHA256 69859e2010813676ef772eff2e5f69b4ef8ac5c4799302f4c51101b3a1510bfd
MD5 4e61a23e708f88b12c6b9804b19c318d
SHA1 ae0da1c2fbf2212be7ab494a695e4f255156f7ae
SHA512 dd98291820235bf04b358f99c41af8ccd727ba75d973749da492b2735d703568675342cf0932690db13c67a63d6a074ac2bef570bde095ac07a4d88f210e10cb
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywax:3LsF2Kerc64sTiX2IV0DhuogwG
TLSH
T142035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 7705289b02c77ab400aa973a7a7f62e1e89d9050a243d6be9ea15b837b59ec9e
MD5 ab09556ee3483725df178fef22456986
SHA1 de3b1090011f1ed71706b5bb53d800540e91f687
SHA512 d9dc12248ff737b76941c7d2fe6323d08dc3c46ceb5a9accd1aaede42f34a9192ced69801ce13cd2e26ea5b58394e113cf97e991e33fcc13210a47c3e10cbc92
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywax:3LsF2Kerc64sTiX2IV0DhuogwK
TLSH
T111035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1124-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2544-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2544-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4524-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4524-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads