OwaAuth uses the filename owaauth.dll, which is a legitimate file that normally resides in %ProgramFiles%\Microsoft\Exchange Server\ClientAccess\Owa\Auth\; the malicious file by the same name is saved in %ProgramFiles%\Microsoft\Exchange Server\ClientAccess\Owa\bin\.2
tool
OwaAuth S0072
- Type
- malware
- Platform
- Windows
- Created
- 31 May 2017
- Last modified
- 25 April 2025
OwaAuth is a Web shell and credential stealer deployed to Microsoft Exchange servers that appears to be exclusively used by Threat Group-3390. [1]
8
Techniques38th pct
6
Tactics53rd pct
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 S0072
OwaAuth captures and DES-encrypts credentials before writing the username and password to a log file, C:\log.txt.3
OwaAuth uses incoming HTTP requests with a username keyword and commands and handles them as instructions to perform actions.5
OwaAuth has a command to list its directory and logical drives.6
OwaAuth is a Web shell that appears to be exclusively used by Threat Group-3390. It is installed as an ISAPI filter on Exchange servers and shares characteristics with the China Chopper Web shell.7
Standing S0072
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 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 / technique21med50th pct
50th percentile · 50% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique3med
Detection coverage S0072
192 distinct rules cover the 8 techniques recorded for this tool. 137 Sigma · 55 Splunk.
7 covered by at least one rule1 with no coverage192 distinct rules in total
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