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Description

This search is to detect a suspicious file creation namely passff.tar and cookie.tar. This files are possible archived of stolen browser information like history and cookies in a compromised machine with IcedID.

  • Type: Hunting
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2021-07-30
  • Author: Teoderick Contreras, Splunk
  • ID: 0db4da70-f14b-11eb-8043-acde48001122

Annotations

ATT&CK
ID Technique Tactic
T1560.001 Archive via Utility Collection
T1560 Archive Collected Data Collection
Kill Chain Phase
  • Exploitation
NIST
CIS20
CVE
1
2
3
4
5
`sysmon` EventCode= 11  (TargetFilename = "*\\passff.tar" OR TargetFilename = "*\\cookie.tar") 
|stats count min(_time) as firstTime max(_time) as lastTime by TargetFilename EventCode process_id  process_name Computer 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `icedid_exfiltrated_archived_file_creation_filter`

Macros

The SPL above uses the following Macros:

Note that icedid_exfiltrated_archived_file_creation_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • _time
  • TargetFilename
  • EventCode
  • process_id
  • process_name
  • Computer

How To Implement

To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.

Known False Positives

unknown

Associated Analytic story

RBA

Risk Score Impact Confidence Message
72.0 80 90 process $SourceImage$ create a file $TargetImage$ in host $Computer$

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 1