# Delta DTM Soft deserialization flaw enables code execution

Published: 2026-06-25 · Severity: medium · Sectors: manufacturing
Canonical: https://vorant.io/reports/47627c93-12fd-5bc0-8183-ba0de9a5eef6/delta-dtm-soft-deserialization-flaw-enables-code-execution

> CVE-2026-12578, a deserialization vulnerability in Delta Electronics DTM Soft (all versions), allows arbitrary code execution via malicious project files.

CISA published an advisory for CVE-2026-12578, a deserialization of untrusted data vulnerability affecting all versions of Delta Electronics DTM Soft, an industrial automation software used in critical manufacturing environments worldwide. The flaw allows an attacker to execute arbitrary code on vulnerable systems through specially crafted project files. Successful exploitation requires user interaction—specifically, opening a malicious project file from an untrusted source.

Delta Electronics acknowledges the vulnerability and is developing a patch. In the interim, the vendor recommends users avoid opening unsolicited project files from emails, network shares, USB drives, or untrusted Internet links, and to run the software with standard user privileges rather than administrator rights to limit potential damage. CISA notes that no public exploitation targeting this vulnerability has been reported, and the vulnerability is not remotely exploitable without user interaction.

The affected product is deployed globally in critical manufacturing sectors. Organizations using DTM Soft should implement the recommended workarounds immediately and monitor Delta's advisory page for patch availability. CISA emphasizes standard ICS security practices including network segmentation, minimizing internet exposure, and using secure remote access methods.

## Mentioned in this report

- Vulnerabilities: CVE-2026-12578

## Detection guidance (public sample)

### Delta DTM Soft Spawning Suspicious Child Process (Possible Deserialization Exploit)

ATT&CK: T1204.002

Detects DTM Soft spawning command interpreters or script hosts shortly after launch, consistent with code execution via a crafted project file deserialization exploit (CVE-2026-12578). Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: Delta DTM Soft Spawning Suspicious Child Process
logsource:
  category: process_creation
  product: windows
detection:
  selection_parent:
    ParentImage|contains:
    - DTM Soft
    - DTMSoft
    - \\Delta Electronics\\
  selection_child:
    Image|endswith:
    - \\cmd.exe
    - \\powershell.exe
    - \\wscript.exe
    - \\cscript.exe
    - \\mshta.exe
    - \\rundll32.exe
    - \\regsvr32.exe
  condition: selection_parent and selection_child
falsepositives:
- Legitimate DTM Soft plugin installers or update scripts invoking command shells
- Administrative automation scripts launched from the DTM Soft install directory
level: high
tags:
- attack.t1204.002
- attack.execution
id: 52301104-56c4-5bbd-b7fb-13b3ee9aed0a
status: experimental
author: Vorant
```

### Delta DTM Soft Opening Project File From Suspicious Location

ATT&CK: T1204.002

Detects DTM Soft process being launched with a command line referencing a project file located in a commonly attacker-abused delivery path such as Downloads, Temp, removable media, or a network share, indicating a user opened an untrusted project file. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: Delta DTM Soft Launched With Project File From Suspicious Path
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|contains:
    - DTM Soft
    - DTMSoft
  selection_path:
    CommandLine|contains:
    - \\Downloads\\
    - \\Temp\\
    - \\AppData\\Local\\Temp\\
    - \\Desktop\\
    - :\\Removable
    - \\\\
  condition: selection_process and selection_path
falsepositives:
- Engineers legitimately opening project files stored on shared network drives or
  removable media as part of normal ICS engineering workflows
- Project files intentionally downloaded from vendor support portals
level: medium
tags:
- attack.t1204.002
- attack.initial_access
- attack.t1566.001
id: 27c7b661-96b3-5b79-8151-dd8b39eeb017
status: experimental
author: Vorant
```

### Delta DTM Soft Making Outbound Network Connection After Launch

ATT&CK: T1204.002

Detects a DTM Soft process establishing an outbound network connection, which is atypical for a local engineering/configuration tool and may indicate post-exploitation callback following successful deserialization code execution. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: Delta DTM Soft Unexpected Outbound Network Connection
logsource:
  category: network_connection
  product: windows
detection:
  selection:
    Image|contains:
    - DTM Soft
    - DTMSoft
    Initiated: true
  filter_local:
    DestinationIp|startswith:
    - '10.'
    - 192.168.
    - 172.16.
  condition: selection and not filter_local
falsepositives:
- Delta DTM Soft license validation or update-check connections to vendor servers
- Configuration data exchange with PLC devices over the local plant network
level: medium
tags:
- attack.t1204.002
- attack.command_and_control
id: c4028aa7-3811-5ce9-90e9-a6631a261ffc
status: experimental
author: Vorant
```

Behavioural rules are generated from public reporting — validate in your environment before deploying.

Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-176-06

---

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