OilCheck
This is a defensive tool-intelligence page. It is intended for analyst navigation, source review, and hunt planning. It is not a malware-analysis report and does not contain sample code or binaries.
Summary
- Associated actor(s): OilRig
- Tool type(s): MITRE-listed software/tool
- Confidence level(s): High
- Source ID(s):
SRC-ESET-OILRIG-ISRAEL
Behavior
| Actor | Behavior Summary |
|---|---|
| OilRig | OilCheck is an OilRig downloader in ESET reporting; it uses cloud-based email services for C2 communications and shares logic with other OilRig cloud-service-powered downloaders. |
Hash And IOC Status
| Actor | Status | Reference |
|---|---|---|
| OilRig | Imported SHA1 seed 8D84D32DF5768B0D4D2AB8B1327C43F17F182001 returned VT not_found and remains unpromoted pending primary hash verification. | SRC-ESET-OILRIG-ISRAEL |
Hashes and IOCs on this page are source pointers or representative public indicators. They SHOULD be refreshed from the linked source before operational use and MUST NOT be used alone for actor attribution.
Defensive Hunting Notes
| Actor | Hunting Notes |
|---|---|
| OilRig | Hunt cloud-mail API calls by unusual executables, unexpected Outlook/EWS traffic from non-mail clients, and OilRig downloader execution near prior SC5k or ODAgent activity. |
Handling Notes
| Actor | Handling Notes |
|---|---|
| OilRig | Use behavior and ESET source context; do not promote unverified hash seeds to blocking controls. |
Crosslinks
- OilRig: profile, workbench, tool matrix
- Detection status: Detection Status Dashboard
- Hunt workflow: Hunt Workflow
Mapped ATT&CK Techniques For Associated Actor(s)
| Actor | Technique | Tactic | Mapping Quality | Source |
|---|---|---|---|---|
| OilRig | T1505.003 Web Shell | Persistence | M3 | SRC-MITRE-G0049 |
| OilRig | T1049 System Network Connections Discovery | Discovery | M1 | SRC-MITRE-G0049 |
Related Actor-Level Repository Detections
These detections are mapped through the associated actor or scenario and are not automatically tool-specific. Promote a tool-specific detection only after the behavior is tied to telemetry and test evidence.
No repository detection is currently mapped to the associated actor(s). Use the hunting notes and source references as backlog input.
Related Actor-Level Hunts
These hunts are mapped through the associated actor or scenario and may need narrowing before they are used for this specific tool.
No repository hunt is currently mapped to the associated actor(s). Create a hunt from the behavior and telemetry notes before proposing a production detection.
Source Review
| Source | Publisher | Date | Reliability | Type | Last Reviewed |
|---|---|---|---|---|---|
SRC-ESET-OILRIG-ISRAEL | ESET Research | 2023-09-21 | A | Vendor CTI | 2026-05-14 |
If a source publishes a large or frequently changing IOC appendix, keep the current IOC list in the source system or TIP and store only the pointer here.