Analysis by: Johnlery Triunfante
ALIASES:

Trojan.AndroidOS.Manuscrypt.a (Kaspersky); Android/NukeSped.A!tr (Fortinet)

 PLATFORM:

Linux, Android OS

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 21,812 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 28 Mar 2017
Payload: Connects to URLs/IPs

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Backdoor drops the following files:

  • /data/system/dnscd.db → Encrypted file containing C&C servers.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Get file list
  • Download file
  • Upload file
  • Execute command
  • Remove file/directory
  • Execute command and send result to C&C
  • Send device information
  • Change directory
  • Switch C&C
  • Terminate self-process
  • Disconnect from C&C and sleep
  • Send C&C list
  • Download C&C list

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.189.174:443
  • {BLOCKED}.{BLOCKED}.200.107:443
  • {BLOCKED}.{BLOCKED}.212.31:443

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.982.01
FIRST VSAPI PATTERN DATE: 21 Feb 2018
VSAPI OPR PATTERN File: 13.983.00
VSAPI OPR PATTERN Date: 22 Feb 2018

Step 1

Trend Micro Mobile Security Solution

Trend Micro Mobile Security Personal Edition protects Android and iOS smartphones and tablets from malicious and Trojanized applications. It blocks access to malicious websites, increase device performance, and protects your mobile data. You may download the Trend Micro Mobile Security apps from the following sites:

Step 2

Remove unwanted apps on your Android mobile device

[ Learn More ]

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