ShrinkLocker captures the IP address of the victim system and sends this to the attacker following encryption.3
tool
ShrinkLocker S1178
- Type
- malware
- Platform
- Windows
- Created
- 7 December 2024
- Last modified
- 12 May 2026
ShrinkLocker is a VBS-based malicious script that leverages the legitimate Bitlocker application to encrypt files on victim systems for ransom. ShrinkLocker functions by using Bitlocker to encrypt files, then renames impacted drives to the adversary’s contact email address to facilitate communication for the ransom payment.[1][2]
21
TechniquesTop 18%
8
TacticsTop 20%
0
Threat groupsNone recorded
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1178
ShrinkLocker will exfiltrate victim system information along with the encryption key via an HTTP POST.45
ShrinkLocker uses WMI to query information about the victim operating system.6
ShrinkLocker checks whether the Bitlocker Drive Encryption Tools service is running.7
ShrinkLocker uses PowerShell to disable protectors used to secure the BitLocker encryption key on victim machines and then delete the key from the system.8
ShrinkLocker is a VisualBasic script (VBS) object that calls multiple other operating system functions during execution.910
Standing S1178
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
Techniques21Top 18%
82nd percentile · 82% 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 groups061% 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 / technique25med60th pct
60th percentile · 60% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique9med
Detection coverage S1178
1142 distinct rules cover the 21 techniques recorded for this tool. The 1222 technique-to-rule mappings resolve to 1142 distinct rules, because one rule can cover several techniques. 724 Sigma · 418 Splunk.
21 covered by at least one rule1142 distinct rules in total
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