@trampo.info - NTAPINSIGHT

Technical Breakdown

Confirmation of File Extension: Every encrypted file receives the secondary extension “.trampo” after its original extension (e.g., “presentation.pptx.trampo”).
Renaming Convention: Aside from appending “.trampo”, the malware prefixes the original filename with a 5-byte uppercase hexadecimal value derived from the client-ID, turning
report.xlsx into A7B3E_report.xlsx.trampo.
Ransom-Note Name: The dropped ransom note is always named HOW TO DECRYPT FILES.txt and is copied into every affected folder as well as on the Windows desktop.

Approximate Start Date/Period: The first large-scale emails carrying the “@trampo.info” payload were detected on 2 March 2017.
Peak Activity: Mid-March through May 2017, with subsequent but smaller-scale refills in Q3 2017.
Security-community Label: Most vendors signature it simply as “Ransomware.Trampo” or “Trojan-Ransom.Win32.DX/n”.

Spear-phishing e-mail—malicious attachment pretending to be “invoice_{{DDMM}}.zip” containing a self-extracting .scr file.
Vulnerability leveraging—the dropper counts on CVE-2017-0199 (malicious RTF → HTA via OLE) to silently execute embedded PowerShell commands.
Weak RDP credentials—post-exploitation lateral movement uses brute-forced Remote-Desktop passwords, then wmic / psexec to push the PE executable as svchost.exe under C:\Perflogs.
No in-the-wild worm component—unlike WannaCry, Trampo does not ship with an SMB exploit, but it does delete shadow copies and turns off VSS after infection.

Disable Office macros unless explicitly required and vetted.
Patch the March 2017 Microsoft Office updates (KB 4013075/KB 4013082) to block CVE-2017-0199.
Disable PowerShell v2/v3 execution policy bypasses via GPO:
Computer → Policies → Administrative Templates → Windows → PowerShell → “Turn on Script Execution: Only signed scripts allowed”.
Lock down RDP: disable direct-exposed RDP or, at minimum, enforce Network-Level Authentication + strong passwords and lock-out policies.
Email hygiene: implement attachment quarantine for ZIP files with *.scr, *.hta, *.js and set up SPF/DKIM/DMARC validation.

Power off networking first (air-gap the host or pull NIC cable / disable Wi-Fi).
Boot into Safe Mode with Networking OFF.
Remove persistence: check HKLM\Software\Microsoft\Windows\CurrentVersion\Run for
DefWatch = C:\Perflogs\svchost.exe and delete.
Delete the working directory %AppData%\Trampo (or the randomized 8-char folder it created).
Run a root-cause scan with updated signatures—治理能力最强的查杀/EDR工具 (e.g., MSERT / Kaspersky Removal Tool / Malwarebytes).
Reboot into normal mode only after the scan confirms a clean bill of health.

Recovery Feasibility: NO public decryptor has been released. Trampo generates a 2048-bit RSA key pair per victim; the private key never touches the client.
Mitigation Fallbacks:
Restore from off-line backups (image-based or cloud snapshot).
Check shadow copies—Trampo tries to purge them with vssadmin delete shadows /all, but some junction-volume snapshots or cloud-linked OneDrive file history may survive.
Volume-image forensics: If the hard drive contained deleted but not overwritten sectors, RAW recovery tools (PhotoRec, TestDisk) can retrieve pre-encryption remnants; success rate is limited to non-fragmented small files.
Paid Recovery Disclaimer: The criminal operators have been observed to supply a working decryptor after ~USD 2,400–3,600 in Bitcoin (2017 rates), yet paying is discouraged for both ethical and no-guarantee reasons.

Unique Characteristics: Trampo computes a CRC32 “fingerprint” of every file before encryption. If it detects a competing strain already encrypted the same file, it aborts encryption on that object to avoid “double ransom” situations—an indicator for forensic teams to notice mismatched timestamps or skipped files.
Network Impact: The campaign mainly targeted manufacturing and logistics firms in central Europe, leading to temporary suspension of several automotive tier-2 supply chains (mandating a “return-to-paper” emergency plan in four plants).
Attribution Indicator: Russian-language comments were found in the dropper PDB path D:\Projects\trampo\Release\trampo.pdb—widely considered commodity ransomware rather than APT.