An adversary may compress and/or encrypt data that is collected prior to exfiltration. Compressing the data can help to obfuscate the collected data and minimize the amount of data sent over the network.1 Encryption can be used to hide information that is being exfiltrated from detection or make exfiltration less conspicuous upon inspection by a defender. Both compression and encryption are done prior to exfiltration, and can be performed using a utility, 3rd party library, or custom method.
- DOJ GRU Indictment Jul 2018
Groups using this technique
| Group | Name | Country |
|---|---|---|
| grp_g1014 | LuminousMoth | China |
| grp_g1043 | BlackByte | — |
| grp_g0032 | Lazarus Group | DPRK |
| grp_g0004 | Ke3chang | — |
| grp_g0037 | FIN6 | — |
| grp_g0035 | Dragonfly | Russia |
| grp_g0001 | Axiom | China |
| grp_g0065 | Leviathan | China |
| grp_g1003 | Ember Bear | Russia |
| grp_g0045 | menuPass | — |
| grp_g0007 | APT28 | Russia |
| grp_g0040 | Patchwork | — |
| grp_g0050 | APT32 | Vietnam |
Claims
No public claim points at this technique yet.
Auto-ingested and not human-reviewed; confidence and validity read by citation.