LunarMail can parse IDAT chunks from .png files to look for zlib-compressed and AES encrypted C2 commands.2
tool
LunarMail S1142
- Type
- malware
- Platform
- Windows
- Created
- 26 June 2024
- Last modified
- 16 August 2024
LunarMail is a backdoor that has been used by Turla since at least 2020 including in a compromise of a European ministry of foreign affairs (MFA) in conjunction with LunarLoader and LunarWeb. LunarMail is designed to be deployed on workstations and can use email messages and Steganography in command and control.[1]
17
Techniques72nd pct
8
TacticsTop 20%
1
Threat groupunranked
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1142
LunarMail has used RC4 and AES to encrypt strings and its exfiltration configuration respectively.3
LunarMail can use email image attachments with embedded data for receiving C2 commands and data exfiltration.4
LunarMail can delete the previously used staging directory and files on subsequent rounds of exfiltration and replace it with a new one.6
LunarMail can set the PR_DELETE_AFTER_SUBMIT flag to delete messages sent for data exfiltration.7
Standing S1142
Reach is how much of ATT&CK this tool touches. Coverage is how well defended each thing it does is, as a median per technique rather than a total — a total would just restate the reach. Each figure is ranked against all 825 ATT&CK software entries only where that population actually spreads. Where most of the population shares one value, a percentile would rank the tie instead of the entity, so the raw value is shown and no rank is claimed.
Reach
Techniques1772nd pct
72nd percentile · 72% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics8Top 20%
80th percentile · 80% of 825 ATT&CK software entries have this many tactics spanned or fewer.
Threat group161% tie · 22 values
61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.
Campaigns085% tie · 8 values
85% of the population shares a single value across only 8 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique15med34th pct
34th percentile · 66% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique4med
Detection coverage S1142
309 distinct rules cover the 17 techniques recorded for this tool. The 319 technique-to-rule mappings resolve to 309 distinct rules, because one rule can cover several techniques. 197 Sigma · 112 Splunk.
16 covered by at least one rule1 with no coverage309 distinct rules in total
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