Live Analysis
Android · ARM64
Stage 2 Payload

Forensic Analysis Report

Reverse-engineering the cellebrite-payload_feb2024.tar archive — examining post-exploitation persistence and SSL/TLS interception capabilities.

Subject Cellebrite Payload
Date Feb 2024
Target Android / Linux
Stage Post-Exploitation
⚠
Disclaimer: This report analyzes provided artifacts for defensive and forensic purposes only. It details the mechanisms of a forensic extraction tool and does not provide instructions for offensive exploitation.
Table of Contents
01

Executive Summary

The analyzed archive is a Stage 2 payload associated with Cellebrite forensic extraction tools. While the initial entry vector (likely a USB driver exploit) is not present in this file, these artifacts demonstrate clear Post-Exploitation Persistence and Traffic Interception capabilities.

The payload targets the Android /data/local/tmp directory to execute a binary named installer and inject command-line arguments into Chrome and Android System WebView. The primary goal is to bypass SSL/TLS security mechanisms, enabling decryption of secure network traffic.

02

Archive Structure & Content

A standard POSIX tar archive containing a directory hierarchy commonly used in Android exploitation to stage binaries in writable, accessible locations.

File Path Purpose
data/local/tmp/.studio/bin/installer Main ELF 64-bit executable. Responsible for installing the agent or modifying system settings.
data/local/chrome-command-line Injects flags directly into the Google Chrome browser process.
data/local/android-webview-command-line Injects flags into Android System WebView — used by many third-party apps to render web content.
data/local/content-shell-command-line Ensures coverage across all Chromium-based rendering engines on the device.
03

SPKI Hash Analysis

The configuration files contain a specific instruction to bypass Certificate Transparency and SSL Pinning for a particular cryptographic key — the "fingerprint" of the forensic tool's interception proxy.

Injected Command
chrome-command-line 
chrome --ignore-certificate-errors-spki-list=33lStcTo3yxzOoH4e6o8Qt+3t7ruZ6Le9iHd4gkKhPg=

Mechanism of Action

Attribution

The hash 33lStcTo3yxzOoH4e6o8Qt+3t7ruZ6Le9iHd4gkKhPg= does not correspond to any standard public Certificate Authority. It is identified as a proprietary CA certificate generated by the Cellebrite UFED agent — unique to its interception engine.

⛔
This CA bypass is invisible to the device owner. No certificate warning is shown. All intercepted HTTPS traffic appears valid to the browser.
04

Binary Analysis: installer

An ELF binary compiled for the ARM64 architecture. Analysis of imports reveals three distinct behavioral clusters:

Stealth — Direct Syscalls

The binary imports the syscall function, invoking kernel functions by numeric ID rather than name. This is a known technique for evading EDR hooks and simple function-name monitoring.

Process Manipulation

Imports of fork, waitpid, kill, and execvp indicate the binary spawns and manages child processes — likely to launch the extraction agent or restart system services (USB/Zigbee daemons).

File System Modification

Presence of chmod, unlink, and sendfile confirms the binary alters file permissions and moves data during the installation phase.

ℹ
These behavioral indicators are consistent with a persistent implant installer, not a passive read-only forensic tool.
05

USB Exploit Context

No explicit USB exploit code is present in this archive. However, the artifacts clearly represent Stage 2 of a multi-phase execution flow:

S1
Initial USB Exploit (not in archive)
A vulnerability in the Android Linux Kernel USB driver (GPU or UVC) is triggered on device connection, granting temporary root access.
S2
Payload Drop (analyzed file)
The exploit drops cellebrite-payload_feb2024.tar into /data/local/tmp, staging the agent and config files.
S3
Execution & Persistence
installer is executed to establish persistence across the extraction session and apply the Chrome/WebView SSL bypasses.
06

Conclusion

The cellebrite-payload_feb2024.tar archive contains the necessary components to transition from a temporary kernel exploit to a functional forensic extraction environment.

It relies on command-line injection into Android's web rendering engines to break SSL encryption, utilizing a hardcoded public key hash (33lStc...) to silently bypass all certificate validation checks. The behavioral profile of the installer binary is consistent with a persistent implant, not a passive forensic imager.

Community Response
GG
Graham Gold
cirriustech.co.uk Mastodon
What the report convincingly shows
  • The analyzed artifact represents a post-exploitation payload, not a simple logical extraction of user files. The archive contains an ELF ARM64 binary alongside config files that override Chrome/WebView command-line flags.
  • These modifications are consistent with active network-traffic interception: injecting flags like --ignore-certificate-errors-spki-list forces Chrome to trust a custom private CA, undermining SSL/TLS and Certificate Transparency protections.
  • The binary's behavior (direct syscalls, fork/exec, filesystem modification via chmod/unlink/sendfile) strongly suggests persistent agent implantation, not passive read of existing data.
  • The design — bridging a likely kernel/USB exploit to dropping a root-capable agent — suggests full device compromise capability, not merely "logical extraction."

In short: this report provides concrete technical evidence that at least some versions of Cellebrite's tooling are more akin to offensive hacking tools than passive forensic imagers.

Why this challenges the "forensic extraction" narrative
  • Traditional forensic tools aim to produce a forensically sound image — read-only, non-destructive, non-modifying.
  • A payload that installs an agent and bypasses SSL/TLS to intercept live traffic goes far beyond passive data extraction. This blurs the line between "forensics" and "active surveillance."
  • If deployed on a device owned by a third party in a criminal investigation, this raises serious integrity and privacy concerns: the tool modifies the device, and intercepted network traffic may reveal far more than static data.
  • In the hands of "less lawful" operators — repressive regimes, intelligence agencies — it is effectively a weapon. There are credible historical reports of exactly this kind of misuse.
  • A tool that relies on a Stage 1 kernel/USB exploit is OS-version and device-specific, raising questions about reliability and forensic reproducibility.
  • From a legal/evidentiary standpoint: if a tool modifies device state before extraction, any resulting report is susceptible to challenges of tampering, chain-of-custody violations, or inadmissibility.
What remains unclear / needs further verification
  • This analysis covers a single payload. We don't know if it represents all Cellebrite extractions or only specific "advanced" modes used in particular jurisdictions or scenarios.
  • The Stage 1 exploit code is absent. Without it, independent reproduction and verification of the initial compromise vector is not possible.
  • There is no evidence about persistence beyond the session — does the agent clean up after itself, or does it leave backdoors? This is critical to assessing "non-destructive" claims.
Recommendations
  1. Treat any cell-phone forensics result as potentially tainted. Assume the extraction tool could install an agent, intercept traffic, or leave residual access.
  2. Demand disclosure of the exact tool version, any exploit chain used, whether an agent was dropped, and whether a verified disk image (before/after) was taken before accepting forensic evidence.
  3. Minimize credential exposure on mobile devices. Avoid storing session tokens or sensitive credentials that could be extracted and used to pivot to cloud resources. Use ephemeral sessions and hardware-backed keys.
  4. Monitor the dual-use surveillance ecosystem. Even "law-enforcement tools" can be used offensively. Open scrutiny, research, and traceability are essential safeguards.