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We determined from the source code of a particular sample that August can
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NET, with samples obfuscated with Confuser.
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In addition to the byte array itself, there are few lines of code that deobfuscate the array through an XOR operation, and execute the “Main” function of the payload.Īugust is written in. The screenshot above shows the payload downloaded from the remote site as a PowerShell byte array.
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įigure 4: Example PowerShell command used to download and execute the byte arrayįigure 5: Snippet of the network traffic returning the byte array used to load August This actor previously used this technique to load POS payloads. Notably, the macro used in this campaign launches a Powershell command to “filelessly” load the payload from a byte array hosted on a remote site. It filters out security researchers and sandboxes using checks including Maxmind, task counts, task names, and recent file counts. The macro used is very similar to the one we discussed in our previous post detailing sandbox evasion techniques used to deliver the Ursnif banking Trojan. Duplicate charges on įigure 1: Example email used to deliver the macro-laden documentįigure 2: Example email used to deliver the macro-laden documentįigure 3: Example macro-laden document attachment used to deliver August.Support: Products disappear from the cart during checkout.- Help: Items vanish from the cart before checkout.The subject lines were personalized with the recipient's domain.
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However, the documents contained macros that could download and install August Stealer. The lures also suggested that the attached document contained detailed information about the issue. August contains stealing functionality targeting credentials and sensitive documents from the infected computer.ĭuring our analysis we found that many of the lures and subject lines of the emails used references to issues with supposed purchases on the company’s website and were targeted at individuals who may be able to provide support for those issues. These campaigns utilized “fileless” loading of a relatively new malware called August through the use of Word macros and PowerShell. During the month of November, Proofpoint observed multiple campaigns from TA530 - an actor we have noted for their highly personalized campaigns - targeting customer service and managerial staff at retailers.