Didier Stevens

Wednesday 17 August 2022

Update: 1768.py Version 0.0.15

Filed under: My Software,Update — Didier Stevens @ 22:30

Some new features that help with analyzing memory dumps.

Here is the analysis of a VMware vmem file:

There’s a new sanity check, determining if an extracted configuration is OK or not OK (NOK).

A config passes the sanity check if it contains a valid payload type and a valid public key.

Configurations that don’t pass the sanity check, are most likely false positives: they have a valid header, but no valid fields. They can show up in memory dumps of Windows machines.

Option -S can be used to hide configurations that don’t pass the sanity check:

Now we are just left with detections of the sleep mask routine. What’s new in this version, is that the position where the signature was found is listed.

Finding both 32-bit and 64-bit routines is unusual.

Option -V can be used to dump 256 bytes before and after the signature, to help us get an idea what we are dealing with.

And what we actually found here, is the memory of the anti-virus program containing signatures, like signatures for Cobalt Strike sleep mask deobfuscation routines.

1768_v0_0_15.zip (http)
MD5: 15EBA21D59D78ED9A674DC2B88687555
SHA256: 73987F1B8577A5C31B2D7BDC197A465F8700B3F3C7838A31802BD77FFC872C42

2 Comments »

  1. […] Didier StevensUpdate: 1768.py Version 0.0.15 […]

    Pingback by Week 34 – 2022 – This Week In 4n6 — Sunday 21 August 2022 @ 11:56

  2. […] Tools: 1768.py […]

    Pingback by 1768.py’s Sanity Check – Didier Stevens Videos — Sunday 28 August 2022 @ 10:48


RSS feed for comments on this post. TrackBack URI

Leave a Reply (comments are moderated)

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Blog at WordPress.com.