Sigma rule: Wab/Wabmig Unusual Parent Or Child Processes

Rule

Title

Wab/Wabmig Unusual Parent Or Child Processes

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2022-08-12

Modified

2022-09-27

File

rules/windows/process_creation/proc_creation_win_wab_unusual_parents.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects unusual parent or children of the wab.exe (Windows Contacts) and Wabmig.exe (Microsoft Address Book Import Tool) processes as seen being used with bumblebee activity

Log source

product

windows

category

process_creation

Detection

selection_parent:
    ParentImage|endswith:
        # Add more if known
        - \WmiPrvSE.exe
        - \svchost.exe
        - \dllhost.exe
    Image|endswith:
        - '\wab.exe'
        - '\wabmig.exe' # (Microsoft Address Book Import Tool)
selection_child:
    # You can add specific suspicious child processes (such as cmd, powershell...) to increase the accuracy
    ParentImage|endswith:
        - '\wab.exe'
        - '\wabmig.exe' # (Microsoft Address Book Import Tool)
condition: 1 of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.execution
• attack.stealth

References

• https://thedfirreport.com/2022/08/08/bumblebee-roasts-its-way-to-domain-admin/
• https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/bumblebee-loader-cybercrime
• https://thedfirreport.com/2022/09/26/bumblebee-round-two/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_wab_unusual_parents.yml