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Detection rules › Sigma

Renamed ZOHO Dctask64 Execution

Status
test
Severity
high
Log source
product windows, category process_creation
Author
Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects a renamed "dctask64.exe" execution, a signed binary by ZOHO Corporation part of ManageEngine Endpoint Central. This binary can be abused for DLL injection, arbitrary command and process execution.

MITRE ATT&CK coverage

TacticTechniques
Privilege EscalationT1055.001 Process Injection: Dynamic-link Library Injection
StealthT1036 Masquerading, T1055.001 Process Injection: Dynamic-link Library Injection, T1202 Indirect Command Execution, T1218 System Binary Proxy Execution

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation

Rule body yaml

title: Renamed ZOHO Dctask64 Execution
id: 340a090b-c4e9-412e-bb36-b4b16fe96f9b
status: test
description: |
    Detects a renamed "dctask64.exe" execution, a signed binary by ZOHO Corporation part of ManageEngine Endpoint Central.
    This binary can be abused for DLL injection, arbitrary command and process execution.
references:
    - https://twitter.com/gN3mes1s/status/1222088214581825540
    - https://twitter.com/gN3mes1s/status/1222095963789111296
    - https://twitter.com/gN3mes1s/status/1222095371175911424
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2020-01-28
modified: 2025-01-22
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1036
    - attack.t1055.001
    - attack.t1202
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Hashes|contains:
            - 'IMPHASH=6834B1B94E49701D77CCB3C0895E1AFD'
            - 'IMPHASH=1BB6F93B129F398C7C4A76BB97450BBA'
            - 'IMPHASH=FAA2AC19875FADE461C8D89DCF2710A3'
            - 'IMPHASH=F1039CED4B91572AB7847D26032E6BBF'
    filter_main_legit_name:
        Image|endswith: '\dctask64.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection and not 1 of filter_main_*

Stage 1: selection

selection:
    Hashes|contains:
        - 'IMPHASH=6834B1B94E49701D77CCB3C0895E1AFD'
        - 'IMPHASH=1BB6F93B129F398C7C4A76BB97450BBA'
        - 'IMPHASH=FAA2AC19875FADE461C8D89DCF2710A3'
        - 'IMPHASH=F1039CED4B91572AB7847D26032E6BBF'

Stage 2: not filter_main_legit_name

filter_main_legit_name:
    Image|endswith: '\dctask64.exe'

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

FieldKindExcluded values
Imageends_with\dctask64.exe

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Hashesmatch
  • IMPHASH=1BB6F93B129F398C7C4A76BB97450BBA corpus 2 (sigma 2)
  • IMPHASH=6834B1B94E49701D77CCB3C0895E1AFD corpus 2 (sigma 2)
  • IMPHASH=F1039CED4B91572AB7847D26032E6BBF corpus 2 (sigma 2)
  • IMPHASH=FAA2AC19875FADE461C8D89DCF2710A3 corpus 2 (sigma 2)