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Wednesday, 6 July 2016

Malware spam with random hexadecimal number leads to Locky

I only have a couple of samples of this very minimalist spam, consisting of just a "Subject" with a random hex number (e.g. 90027696CCCC611D) and a matching .DOCM attachment (e.g. 90027696CCCC611D.docm).

My trusted analysis source (thank you) says that these DOCM files contain a macro (no surprises there) that downloads a binary from the following locations:

blingberry24.com/90ujn3b8c3
danseduchat.com/90ujn3b8c3
harveyventuresltd.com/90ujn3b8c3
noveltybella.com/90ujn3b8c3
www.proxiassistant-ao.com/90ujn3b8c3
www.sacandolalengua.com/90ujn3b8c3


The payload is Locky ransomware with a detection rate of 3/52. The same source says that C2 locations are:

89.108.84.42 (Agava JSC, Russia)
148.163.73.29 (GreencloudVPS JSC, Vietnam)


Agava in particular is a regular source of badness, and I would suggest that you consider blocking the entire 89.108.80.0/20 range, or at least this minimum recommended blocklist:

89.108.84.42
148.163.73.29


UPDATE 2016-07-08

A variant of this spam run is in progress which adds the words RE, FW, Scan, Emailing or File to the random number. A trusted source (thank you) informs me that the download locations for the DOCM files in this case are:

abschlepp-taxi24.at/87yg5fd5
caijiachina.com/87yg5fd5
drpampe.com/87yg5fd5
felicecremesini.com/87yg5fd5
fermmedia.com/87yg5fd5
gebrauchtkauf.at/87yg5fd5
kurumenishimura.com/87yg5fd5
manutenzionecarrier.com/87yg5fd5
seferworld.com/87yg5fd5
snupress.com/87yg5fd5
themeidea.com/87yg5fd5

A malicious file is dropped with a detection rate of 3/55 which then phones home to the following server:

51.255.172.55 (OVH, France)

I recommend that you blog traffic to that IP.

1 comment:

SpareSimian said...

I see you post malicious IP addresses with each report. Do you have a centralized list of these that could be used to feed an iptables or router block list? Something similar to the Spamhaus EDROP list would be ideal.