Siesta
Posted: April 17, 2014
Threat Metric
The following fields listed on the Threat Meter containing a specific value, are explained in detail below:
Threat Level: The threat level scale goes from 1 to 10 where 10 is the highest level of severity and 1 is the lowest level of severity. Each specific level is relative to the threat's consistent assessed behaviors collected from SpyHunter's risk assessment model.
Detection Count: The collective number of confirmed and suspected cases of a particular malware threat. The detection count is calculated from infected PCs retrieved from diagnostic and scan log reports generated by SpyHunter.
Volume Count: Similar to the detection count, the Volume Count is specifically based on the number of confirmed and suspected threats infecting systems on a daily basis. High volume counts usually represent a popular threat but may or may not have infected a large number of systems. High detection count threats could lay dormant and have a low volume count. Criteria for Volume Count is relative to a daily detection count.
Trend Path: The Trend Path, utilizing an up arrow, down arrow or equal symbol, represents the level of recent movement of a particular threat. Up arrows represent an increase, down arrows represent a decline and the equal symbol represent no change to a threat's recent movement.
% Impact (Last 7 Days): This demonstrates a 7-day period change in the frequency of a malware threat infecting PCs. The percentage impact correlates directly to the current Trend Path to determine a rise or decline in the percentage.
Threat Level: | 1/10 |
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Infected PCs: | 166 |
First Seen: | April 17, 2014 |
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Last Seen: | July 11, 2023 |
OS(es) Affected: | Windows |
Siesta is a cyber espionage campaign which targets many organizations of different industries. The spread malware infection is dubbed Siesta on account of periods of dormancy to access at regular intervals with emails affecting executives of the company. The sender's email address is spoofed to appear as if it was sent by another employee of the company. The malicious messages do not contain a malware threat, but they carry links which direct to a download website. The website containing the malware infection is named [malicious domain]/ [organization name]/[legitimate archive name].zip. The archive contains an executable which when first looked upon looks like a safe PDF document but when executed, a legitimate PDF file which may have been taken from the affected company's website and a malicious component is dropped. The malware infection, known as Siesta, secretly enters into the PC when the victimized computer user is looking at the PDF document and starts communicating with a command and control server from which it receives commands like 'sleep' and 'download'. The sleep command instructs the malware threat to remain idle for specified number of minutes before resuming its activities and the download command instructs the malware infection to download and execute an additional malicious component. In actuality, the name Siesta campaign is based on the use of sleep command ('siesta' means 'nap' in Spanish).
Technical Details
File System Modifications
Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.
The following files were created in the system:[malicious domain]/ [organization name]/[legitimate archive name].zip
File name: [malicious domain]/ [organization name]/[legitimate archive name].zipMime Type: unknown/zip
Group: Malware file
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