POSHSPY appends a file signature header (randomly selected from six file types) to encrypted data prior to upload or download.2
tool
POSHSPY S0150
- Type
- malware
- Platform
- Windows
- Created
- 14 December 2017
- Last modified
- 25 April 2025
POSHSPY is a backdoor that has been used by APT29 since at least 2015. It appears to be used as a secondary backdoor used if the actors lost access to their primary backdoors. [1]
8
Techniques38th pct
6
Tactics53rd pct
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 S0150
POSHSPY uses PowerShell to execute various commands, one to execute its payload.4
POSHSPY modifies timestamps of all downloaded executables to match a randomly selected file created prior to 2013.5
POSHSPY downloads and executes additional PowerShell code and Windows binaries.6
POSHSPY uses a WMI event subscription to establish persistence.7
Standing S0150
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
Techniques838th pct
38th percentile · 62% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics653rd pct
53rd percentile · 53% 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 / technique11medBottom 18%
18th percentile · 82% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique6.5med
Detection coverage S0150
479 distinct rules cover the 8 techniques recorded for this tool. The 577 technique-to-rule mappings resolve to 479 distinct rules, because one rule can cover several techniques. 357 Sigma · 122 Splunk.
8 covered by at least one rule479 distinct rules in total
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