Adversaries may be using unknown stealer malware to exfiltrate sensitive data by leveraging compromised credentials or network access. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate potential data theft operations before they escalate.
IOC Summary
Malware Family: Unknown Stealer Total IOCs: 9 IOC Types: domain, url
| Type | Value | Threat Type | First Seen | Confidence |
|---|---|---|---|---|
| domain | driftpress11.com | botnet_cc | 2026-05-27 | 100% |
| domain | bremadsf.com | payload_delivery | 2026-05-27 | 100% |
| url | hxxps://driftpress11.com/curl/bbaebdea08c804297a988ec4200424600767ddc94cacc38931f8c430ba93d3d0 | botnet_cc | 2026-05-27 | 100% |
| url | hxxps://bremadsf.com/ | payload_delivery | 2026-05-27 | 100% |
| url | hxxps://sites.google.com/view/xbiernlk | payload_delivery | 2026-05-27 | 100% |
| domain | homeinspectionsdelaware.com | payload_delivery | 2026-05-27 | 100% |
| url | hxxp://homeinspectionsdelaware.com/curl/75ddfbae4fcacede52ef513ce634f82ad3d8358984b0bd49756cc8c50a55d501 | payload_delivery | 2026-05-27 | 100% |
| url | hxxps://sites.google.com/view/payforwin | payload_delivery | 2026-05-27 | 100% |
| url | hxxps://payforwin.github.io/desktop.html | payload_delivery | 2026-05-27 | 100% |
// Hunt for DNS queries to known malicious domains
// Source: ThreatFox - Unknown Stealer
let malicious_domains = dynamic(["driftpress11.com", "bremadsf.com", "homeinspectionsdelaware.com"]);
DnsEvents
| where Name has_any (malicious_domains)
| project TimeGenerated, Computer, Name, IPAddresses, QueryType
| order by TimeGenerated desc// Hunt for access to known malicious URLs
// Source: ThreatFox - Unknown Stealer
let malicious_urls = dynamic(["https://driftpress11.com/curl/bbaebdea08c804297a988ec4200424600767ddc94cacc38931f8c430ba93d3d0", "https://bremadsf.com/", "https://sites.google.com/view/xbiernlk", "http://homeinspectionsdelaware.com/curl/75ddfbae4fcacede52ef513ce634f82ad3d8358984b0bd49756cc8c50a55d501", "https://sites.google.com/view/payforwin", "https://payforwin.github.io/desktop.html"]);
UrlClickEvents
| where Url has_any (malicious_urls)
| project Timestamp, AccountUpn, Url, ActionType, IsClickedThrough
| order by Timestamp desc| Sentinel Table | Notes |
|---|---|
DnsEvents | Ensure this data connector is enabled |
UrlClickEvents | Ensure this data connector is enabled |
Scenario: Legitimate Scheduled Job for System Maintenance
Description: A scheduled task runs a script that downloads a file from a known benign source as part of a routine system update or patching process.
Filter/Exclusion: Exclude files downloaded from trusted internal repositories or known update servers (e.g., file.source == "internal-update-server.example.com").
Scenario: Admin Task Using Known Stealer Tool for Data Exfiltration
Description: A system administrator uses a legitimate data exfiltration tool (e.g., scp, rsync) to transfer data between servers as part of a sanctioned data migration.
Filter/Exclusion: Exclude traffic between internal servers with known IP ranges (e.g., src_ip in ["10.0.0.0/8", "192.168.0.0/16"]).
Scenario: False Positive from ThreatFox Integration
Description: A file hash from a legitimate tool (e.g., 7-Zip, WinRAR) is mistakenly flagged by ThreatFox as a stealer IOC due to a hash collision or outdated database.
Filter/Exclusion: Exclude known benign tools using their file names or hashes (e.g., file.name == "7z.exe" or file.hash in ["hash1", "hash2"]).
Scenario: Legitimate Log Collection via PowerShell
Description: A PowerShell script runs as part of a log collection process, using Invoke-WebRequest to fetch logs from a central logging server.
Filter/Exclusion: Exclude PowerShell scripts that match known log collection patterns (e.g., process.name == "powershell.exe" and script_name contains "log-collect").
Scenario: False Positive from Malicious IP in Whitelisted Range
Description: A legitimate IP