Mapping IndigoDrop Malware & Blocking Critical IOCs
Malicious campaigns like IndigoDrop are no longer single files or lone command-and-control servers. They behave like distributed, evolving infrastructures.
Mapping IndigoDrop Malware Infrastructure Mapping Service
Malicious campaigns like IndigoDrop are no longer single files or lone command-and-control servers. They behave like distributed, evolving infrastructures. Our service, Mapping IndigoDrop, builds a living infrastructure map of this threat so your blue team can see how the campaign is stitched together (droppers → maldocs → beacons → shellcode hosts → pastebins → persistence), prioritize blocks, and run targeted hunts, all without naming specific third‑party tools.
Below you’ll find:
A concise explanation of the service and value.
A focused IOC table (3 items per IOC category) you can ingest into firewalls, EDR, and SIEM.
Quick tactical recommendations to harden your estate.
A short note on an important pattern we observed in these IOCs.
What “Mapping IndigoDrop” does for you
Visualize the kill chain as an infrastructure graph: email-delivery → dropper → payload → C2/beacon → shellcode/paste host. Seeing the links reveals choke points for disruption.
Prioritize containment by scoring nodes (public-facing servers, malware drop locations, pastebins) by risk and prevalence.
Automate blocklists: export curated IOC bundles (IPs, URLs, hashes, filenames) to firewalls, proxy filters, endpoint agents, and block‑lists.
Hunt proactively: provide ready-made detection recipes and graph-driven queries your SOC can run (e.g., search for beacon patterns that reference known jQuery filenames).
Monitor changes: alerts when new nodes (IPs/URLs) spin up that connect to known beacons, enabling faster takedown requests or network blocks.
Quick Security Finding, IP geolocation pattern
Within the collected IOCs, a concerning pattern emerges: multiple IP addresses and hostnames (e.g., the 139.59.x.x and 202.59.x.x ranges, along with several related hosts) are actively serving Cobalt Strike beacon payloads and decoder/jQuery files. These IP ranges are primarily assigned to networks in India, and in this dataset, they are being used to host Cobalt Strike beacons and associated shellcode. This geolocation pattern should be treated as a high priority for blocking, monitoring, and upstream abuse reporting. Defenders should escalate any alerts related to these IPs, as it’s a critical piece of the IndigoDrop infrastructure. This pattern is a key indicator for prioritization in threat detection and response.
Curated IOC table, block / ingest these first
| Category | IOC Type | Example IOCs |
|---|---|---|
| Maldoc Hashes | Hashes | 7a5b645a6ea07f1420758515661051cff71cdb34d2df25de6a62ceb15896a1b6, b11dbaf0dd37dd4079bfdb0c6246e53bc75b25b3a260c380bb92fcaec30ec89b, aeb38a11ffc62ead9cdabba1e6aa5fce28502a361725f69586c70e16de70df2c |
| Dropper Hashes | Hashes | 3bb90869523233cf965cf4a171d255c891c0179afd6d28198aa2af4e934f0055, 570ef552b426f8337514ebdcb5935a132e5a8851a7252528c49d6d0d4aba34d9, 059606e707a90333528043bdefbc7a55a27205aabed0ccd46c3966c2a53eea4e |
| Cobalt Strike Beacons | Hashes | 482858b70888acf67a5c2d30ddee61ca7b57ff856feaad9a2fa2b5d4bc0bbd7d, 689f7d3f0def72248c4ff4b30da5022ec808a20e99b139e097c2a0d0ba5bab66, dbb5bba499e0ab07e545055d46acf3f78b5ed35fff83d9c88ce57c6455c02091 |
| IP Addresses | IPs | 134.209.196.51, 139.59.1.154, 188.166.14.73 |
| Shellcode URLs | URLs | hxxp://139.59.1.154:8201/cmelkmkl.txt, hxxp://157.245.78.153/11.txt, hxxp://202.59.79.131/o2Q7NGUwpFfDzcLMnkuMyAy-IGt8KERPl-6lrRhxcbPJkZwAr33 |
Recommended immediate actions
1. Ingest the IOC table (above) into: perimeter firewalls, proxy/URL filter, IDS/IPS, EDR allow/block lists, and your central threat intel feed.
2. Block and monitor the noted IPs/URLs at the proxy and firewall, but validate in a sandbox before broad takedowns (to avoid false positives on shared hosts).
3. Hunt for related indicators in logs: look for HTTP GETs requesting jquery-3.3..min.js from unusual origins; search for connections to the IPs in the IOC table; flag processes spawning interpreters (Python EXEs) that match the hashes.
4. Triage and isolate endpoints that match the maldoc or dropper hashes for forensics and containment.
5. Report abusive hosts to upstream providers and file abuse tickets for the IPs serving Cobalt Strike beacons (provider contact + timestamped evidence).
6. User awareness: send a short advisory to staff warning about maldocs delivered via shortened links (bit.ly) and attachmentless social engineering.
7. Threat intelligence sharing: share the curated IOC bundle with peers and ISACs (as appropriate), and request reciprocal intel about new hosts tied to the campaign.
Why a mapped infrastructure matters
Blocking single IPs or hashes is reactive. Mapping reveals persistent nodes (pastebins, paste/raw endpoints, shared hosting that repeatedly hosts beacons) and lets you:
Put long‑term mitigations where they matter (upstream abuse, hosting provider engagement).
Detect pivot chains, e.g., a pastebin → shellcode → beacon that indicates active compromise.
Reduce analyst time by surfacing the highest‑risk nodes in the infra graph.
Want us to do this for your environment?
We can:
Produce a bespoke IndigoDrop infrastructure map for your environment (visual graph + prioritized remediation plan).
Export ready-to-load blocklists and hunting queries for common SIEM/EDR platforms.
Run an operational takedown package (abuse tickets, legal-ready evidence) for high-risk hosts.
