Cobalt Strike Download
#1214983: APT10 Using Cobalt Strike - Confirm new attack with APT attacker group menuPass (APT10) In Japanese Translated: Confirm new attack with APT attacker group menuPass (APT10) Our company threat analysis team examines various attacker groups targeting Japan daily. Among them, it was confirmed that menuPass (APT 10) * 1 was carrying out an attack exploiting the multifunction penetration test tool Cobalt Strike * 1 from late April 2018.
PyCobalt is a Python API for Cobalt Strike. PyCobalt comes in two parts: a Python library and an Aggressor library. The Python library provides an API for Python scripts to call Aggressor functions and register aliases, commands, and event handlers.
Cobalt Strike has been reported to have been exploited by attacker groups such as APT 19 * 2, Ocean Lotus * 3, PassCV (Winnti) * 4 and cyber crime * 5, and it is not an unusual attack method, but menuPass is exploited It is the first case to do. * 1 menuPass is an attacker group (campaign name), which mainly targets Japanese college organization and government relations since around 2011. As reported in Trend Micro's blog * 6 at the end of March 2018, menuPass has been attacking Japanese organizations every day by exploiting new attack methods and attack tools every day. Focusing on the menuPass attack tool, you can also check the use of your own developed malware (ChChes, ANEL, etc.), but you can especially see attacks that exploit open source or commercial penetration test tools as shown in Table 1. The reason for this is to make attack easier by using open source or commercial penetration tools or obfuscate the identity of the organization behind by anonymizing the attack. Attacker group Open source tool / Commercial penetration tool menuPass (APT 10) PowerSploit, Koadic, QuasarRAT, Redleaves (Trochilus), PowerShell Empire, DKMC, Cobalt Strike Table 1 Attack tool example exploited by menuPass (APT 10) Below we will report the results of two targeted mail attacks exploiting Cobalt Strike by menuPass. Misuse of an executable encrypted file About late April 2018, a targeted e-mail with an executable encrypted file was sent to multiple Japanese organizations.
Figure 1 is a schematic diagram showing the flow of a series of attacks starting with this targeted mail. Figure 1 Schematic diagram of an exploit using an executable encrypted file Figure 1 Schematic diagram of an exploit using an executable encrypted file Initially, if you execute an executable encrypted file attached to targeted mail, an illegal file with the double extension '.
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Doc.scr' will be expanded (1). Three files ('peisnce.exe', 'vntfxf32.dll', 'jeosa.ows') on the red border line in Figure 1 are created when you execute the expanded illegal file and 'peisnce.exe' is created It will be executed (②). At that time, a decoy file will also be displayed at the same time to trick the user.
As shown in FIG. 2, the three created files are divided into three encrypted data (unk - 57 A 648, unk - 595510, unk - 5 B 2 D 10) included in the. Data section in the illegal file with double extension, It is created by XOR operation (encryption key: 0x36) for the length enclosed by the line and decoding the data. Three encrypted data contained in the data section Figure 2. Three encrypted data contained in the data section One of the created files 'peisnce.exe' first reads the loader 'vntfxf32.dll' file expanded in the same directory. Next, the loaded dll file reads the encrypted shell code 'jeosa.ows' file.