Malware Analysis Report

2024-07-28 11:43

Sample ID 240627-vyjh3s1gqg
Target ERMAK.apk
SHA256 7a4238fc6f5d3c7731c2eb33911298eaa36986040858af56e76628c5dc83e265
Tags
ermac banker collection credential_access discovery evasion impact infostealer persistence stealth trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

7a4238fc6f5d3c7731c2eb33911298eaa36986040858af56e76628c5dc83e265

Threat Level: Known bad

The file ERMAK.apk was found to be: Known bad.

Malicious Activity Summary

ermac banker collection credential_access discovery evasion impact infostealer persistence stealth trojan

Ermac2 payload

Ermac family

Ermac

Removes its main activity from the application launcher

Obtains sensitive information copied to the device clipboard

Queries the phone number (MSISDN for GSM devices)

Makes use of the framework's Accessibility service

Declares broadcast receivers with permission to handle system events

Reads information about phone network operator.

Requests disabling of battery optimizations (often used to enable hiding in the background).

Queries the mobile country code (MCC)

Declares services with permission to bind to the system

Makes use of the framework's foreground persistence service

Acquires the wake lock

Requests dangerous framework permissions

Performs UI accessibility actions on behalf of the user

Queries the unique device ID (IMEI, MEID, IMSI)

Registers a broadcast receiver at runtime (usually for listening for system events)

Uses Crypto APIs (Might try to encrypt user data)

Checks memory information

Checks CPU information

MITRE ATT&CK Matrix

N/A

Analysis: static1

Detonation Overview

Reported

2024-06-27 17:23

Signatures

Ermac family

ermac

Ermac2 payload

Description Indicator Process Target
N/A N/A N/A N/A

Declares broadcast receivers with permission to handle system events

Description Indicator Process Target
Required by device admin receivers to bind with the system. Allows apps to manage device administration features. android.permission.BIND_DEVICE_ADMIN N/A N/A

Declares services with permission to bind to the system

Description Indicator Process Target
Required by accessibility services to bind with the system. Allows apps to access accessibility features. android.permission.BIND_ACCESSIBILITY_SERVICE N/A N/A

Requests dangerous framework permissions

Description Indicator Process Target
Allows an application to request installing packages. android.permission.REQUEST_INSTALL_PACKAGES N/A N/A
Allows an application to initiate a phone call without going through the Dialer user interface for the user to confirm the call. android.permission.CALL_PHONE N/A N/A
Allows an application to receive SMS messages. android.permission.RECEIVE_SMS N/A N/A
Allows an application to read SMS messages. android.permission.READ_SMS N/A N/A
Allows an application to send SMS messages. android.permission.SEND_SMS N/A N/A
Allows an application to read the user's contacts data. android.permission.READ_CONTACTS N/A N/A
Allows access to the list of accounts in the Accounts Service. android.permission.GET_ACCOUNTS N/A N/A
Allows read only access to phone state, including the current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device. android.permission.READ_PHONE_STATE N/A N/A
Allows read access to the device's phone number(s). android.permission.READ_PHONE_NUMBERS N/A N/A
Allows an app to create windows using the type LayoutParams.TYPE_APPLICATION_OVERLAY, shown on top of all other apps. android.permission.SYSTEM_ALERT_WINDOW N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-27 17:23

Reported

2024-06-27 17:27

Platform

android-x86-arm-20240624-en

Max time kernel

179s

Max time network

178s

Command Line

nusku.ermacv2.apk

Signatures

Ermac

banker trojan infostealer ermac

Removes its main activity from the application launcher

stealth trojan evasion
Description Indicator Process Target
N/A N/A N/A N/A

Makes use of the framework's Accessibility service

collection evasion credential_access
Description Indicator Process Target
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfoByAccessibilityId N/A N/A
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId N/A N/A
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByText N/A N/A

Queries the phone number (MSISDN for GSM devices)

discovery

Acquires the wake lock

Description Indicator Process Target
Framework service call android.os.IPowerManager.acquireWakeLock N/A N/A

Makes use of the framework's foreground persistence service

evasion persistence
Description Indicator Process Target
Framework service call android.app.IActivityManager.setServiceForeground N/A N/A

Performs UI accessibility actions on behalf of the user

evasion
Description Indicator Process Target
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A

Queries the mobile country code (MCC)

discovery
Description Indicator Process Target
Framework service call com.android.internal.telephony.ITelephony.getNetworkCountryIsoForPhone N/A N/A

Queries the unique device ID (IMEI, MEID, IMSI)

discovery

Reads information about phone network operator.

discovery

Requests disabling of battery optimizations (often used to enable hiding in the background).

evasion
Description Indicator Process Target
Intent action android.settings.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS N/A N/A

Registers a broadcast receiver at runtime (usually for listening for system events)

persistence
Description Indicator Process Target
Framework service call android.app.IActivityManager.registerReceiver N/A N/A

Uses Crypto APIs (Might try to encrypt user data)

impact
Description Indicator Process Target
Framework API call javax.crypto.Cipher.doFinal N/A N/A

Checks CPU information

Description Indicator Process Target
File opened for read /proc/cpuinfo N/A N/A

Checks memory information

Description Indicator Process Target
File opened for read /proc/meminfo N/A N/A

Processes

nusku.ermacv2.apk

Network

Country Destination Domain Proto
N/A 224.0.0.251:5353 udp
GB 216.58.204.74:443 tcp
US 1.1.1.1:53 semanticlocation-pa.googleapis.com udp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
GB 142.250.187.206:443 tcp
US 1.1.1.1:53 android.apis.google.com udp
GB 142.250.187.238:443 android.apis.google.com tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-27 17:23

Reported

2024-06-27 17:27

Platform

android-x64-20240624-en

Max time kernel

179s

Max time network

180s

Command Line

nusku.ermacv2.apk

Signatures

Ermac

banker trojan infostealer ermac

Removes its main activity from the application launcher

stealth trojan evasion
Description Indicator Process Target
N/A N/A N/A N/A

Makes use of the framework's Accessibility service

collection evasion credential_access
Description Indicator Process Target
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfoByAccessibilityId N/A N/A
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId N/A N/A
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByText N/A N/A

Obtains sensitive information copied to the device clipboard

collection credential_access impact
Description Indicator Process Target
Framework service call android.content.IClipboard.addPrimaryClipChangedListener N/A N/A

Queries the phone number (MSISDN for GSM devices)

discovery

Acquires the wake lock

Description Indicator Process Target
Framework service call android.os.IPowerManager.acquireWakeLock N/A N/A

Makes use of the framework's foreground persistence service

evasion persistence
Description Indicator Process Target
Framework service call android.app.IActivityManager.setServiceForeground N/A N/A

Performs UI accessibility actions on behalf of the user

evasion
Description Indicator Process Target
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A

Queries the mobile country code (MCC)

discovery
Description Indicator Process Target
Framework service call com.android.internal.telephony.ITelephony.getNetworkCountryIsoForPhone N/A N/A

Queries the unique device ID (IMEI, MEID, IMSI)

discovery

Reads information about phone network operator.

discovery

Registers a broadcast receiver at runtime (usually for listening for system events)

persistence
Description Indicator Process Target
Framework service call android.app.IActivityManager.registerReceiver N/A N/A

Uses Crypto APIs (Might try to encrypt user data)

impact
Description Indicator Process Target
Framework API call javax.crypto.Cipher.doFinal N/A N/A

Checks CPU information

Description Indicator Process Target
File opened for read /proc/cpuinfo N/A N/A

Checks memory information

Description Indicator Process Target
File opened for read /proc/meminfo N/A N/A

Processes

nusku.ermacv2.apk

Network

Country Destination Domain Proto
N/A 224.0.0.251:5353 udp
HK 103.139.1.202:3434 tcp
US 1.1.1.1:53 ssl.google-analytics.com udp
GB 142.250.187.232:443 ssl.google-analytics.com tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
GB 142.250.187.206:443 tcp
US 1.1.1.1:53 android.apis.google.com udp
GB 142.250.179.238:443 android.apis.google.com tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
GB 142.250.180.4:443 tcp
GB 142.250.180.4:443 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
GB 172.217.16.238:443 tcp
GB 142.250.179.226:443 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp

Files

N/A

Analysis: behavioral3

Detonation Overview

Submitted

2024-06-27 17:23

Reported

2024-06-27 17:27

Platform

android-x64-arm64-20240624-en

Max time kernel

178s

Max time network

180s

Command Line

nusku.ermacv2.apk

Signatures

Ermac

banker trojan infostealer ermac

Removes its main activity from the application launcher

stealth trojan evasion
Description Indicator Process Target
N/A N/A N/A N/A

Makes use of the framework's Accessibility service

collection evasion credential_access
Description Indicator Process Target
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfoByAccessibilityId N/A N/A
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId N/A N/A
Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByText N/A N/A

Obtains sensitive information copied to the device clipboard

collection credential_access impact
Description Indicator Process Target
Framework service call android.content.IClipboard.addPrimaryClipChangedListener N/A N/A

Queries the phone number (MSISDN for GSM devices)

discovery

Acquires the wake lock

Description Indicator Process Target
Framework service call android.os.IPowerManager.acquireWakeLock N/A N/A

Makes use of the framework's foreground persistence service

evasion persistence
Description Indicator Process Target
Framework service call android.app.IActivityManager.setServiceForeground N/A N/A

Performs UI accessibility actions on behalf of the user

evasion
Description Indicator Process Target
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A
N/A android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction N/A N/A

Queries the mobile country code (MCC)

discovery
Description Indicator Process Target
Framework service call com.android.internal.telephony.ITelephony.getNetworkCountryIsoForPhone N/A N/A

Queries the unique device ID (IMEI, MEID, IMSI)

discovery

Reads information about phone network operator.

discovery

Requests disabling of battery optimizations (often used to enable hiding in the background).

evasion
Description Indicator Process Target
Intent action android.settings.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS N/A N/A

Uses Crypto APIs (Might try to encrypt user data)

impact
Description Indicator Process Target
Framework API call javax.crypto.Cipher.doFinal N/A N/A

Checks CPU information

Description Indicator Process Target
File opened for read /proc/cpuinfo N/A N/A

Checks memory information

Description Indicator Process Target
File opened for read /proc/meminfo N/A N/A

Processes

nusku.ermacv2.apk

Network

Country Destination Domain Proto
N/A 224.0.0.251:5353 udp
HK 103.139.1.202:3434 tcp
US 1.1.1.1:53 ssl.google-analytics.com udp
GB 172.217.16.232:443 ssl.google-analytics.com tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
GB 142.250.187.206:443 tcp
GB 142.250.187.206:443 tcp
US 1.1.1.1:53 android.apis.google.com udp
GB 172.217.16.238:443 android.apis.google.com tcp
HK 103.139.1.202:3434 tcp
GB 142.250.187.228:443 tcp
GB 142.250.187.228:443 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp
HK 103.139.1.202:3434 tcp

Files

N/A