PULSECHECK can use Unix shell script for command execution.2
tool
PULSECHECK S1108
- Type
- malware
- Platforms
- Network Devices, Linux
- Created
- 8 February 2024
- Last modified
- 15 April 2025
PULSECHECK is a web shell written in Perl that was used by APT5 as early as 2020 including against Pulse Secure VPNs at US Defense Industrial Base (DIB) companies.[1]
4
TechniquesBottom 17%
3
TacticsBottom 21%
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 S1108
PULSECHECK can check HTTP request headers for a specific backdoor key and if found will output the result of the command in the variable HTTP_X_CMD.3
PULSECHECK can base-64 encode encrypted data sent through C2.4
PULSECHECK is a web shell that can enable command execution on compromised servers.5
Standing S1108
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
Techniques4Bottom 17%
17th percentile · 83% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics3Bottom 21%
21st percentile · 79% of 825 ATT&CK software entries have more tactics spanned.
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 / technique42medTop 12%
88th percentile · 88% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique3med
Detection coverage S1108
145 distinct rules cover the 4 techniques recorded for this tool. 100 Sigma · 45 Splunk.
4 covered by at least one rule145 distinct rules in total
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