ermac | 52435cd21f3d725029038fd4c24e22f819dee4ea035107bb30ee2895d9d02b29

Analysis

max time kernel
149s
max time network
153s
platform
android_x64
resource
android-x64-arm64-20240221-en
resource tags

androidarch:armarch:arm64arch:x64arch:x86image:android-x64-arm64-20240221-enlocale:en-usos:android-11-x64system
submitted
16/04/2024, 22:01

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General

Target

52435cd21f3d725029038fd4c24e22f819dee4ea035107bb30ee2895d9d02b29.apk
Size

994KB
MD5

b5ee66fe34fab727ce1541e054bbd8a5
SHA1

8f4836b5604816f398eee8d42073eca89bfeb145
SHA256

52435cd21f3d725029038fd4c24e22f819dee4ea035107bb30ee2895d9d02b29
SHA512

9e699052d0fb9c4b1fe06e0b24d160a861da18ce4c2f754d92c005a3ad112385744d0e8ad4d2b29ad173c1b1f7265fdfdba5f26b9790abf9a47dfcdfe4f81900
SSDEEP

24576:zTww2poKQAdjHLE3z48qKCfCVCwCICHCCCnCICrCXgSDUW:z8w5XYasge0V5WHWpiKgSn

Score

10^/10

ermac banker collection discovery evasion infostealer persistence stealth trojan

Malware Config

Extracted

Family

ermac

http://87.120.84.22:3434

AES_key

Signatures

Ermac
An Android banking trojan first seen in July 2021.
banker trojan infostealer ermac

Makes use of the framework's Accessibility service 2 TTPs 3 IoCs

Retrieves information displayed on the phone screen using AccessibilityService.

collection evasion

Input Injection

T1516

Screen Capture

T1513

description	ioc	Process
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfoByAccessibilityId	nusku.ermacv2.apk
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId	nusku.ermacv2.apk
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByText	nusku.ermacv2.apk

Queries a list of all the installed applications on the device (Might be used in an attempt to overlay legitimate apps) 1 TTPs
banker discovery

Security Software Discovery
T1418.001

Removes its main activity from the application launcher 1 TTPs 1 IoCs

stealth trojan evasion

Suppress Application Icon

T1628.001

pid	Process
4417	nusku.ermacv2.apk

Checks CPU information 2 TTPs 1 IoCs

Checks CPU information which indicate if the system is an emulator.

evasion discovery

System Checks

T1633.001

System Information Discovery

T1426

description	ioc	Process
File opened for read	/proc/cpuinfo	nusku.ermacv2.apk

Checks memory information 2 TTPs 1 IoCs

Checks memory information which indicate if the system is an emulator.

evasion discovery

System Checks

T1633.001

System Information Discovery

T1426

description	ioc	Process
File opened for read	/proc/meminfo	nusku.ermacv2.apk

Makes use of the framework's foreground persistence service 1 TTPs 1 IoCs

Application may abuse the framework's foreground service to continue running in the foreground.

evasion persistence

Foreground Persistence

T1541

description	ioc	Process
Framework service call	android.app.IActivityManager.setServiceForeground	nusku.ermacv2.apk

Queries the phone number (MSISDN for GSM devices) 1 TTPs
discovery

System Network Configuration Discovery
T1422

Acquires the wake lock 1 IoCs

description	ioc	Process
Framework service call	android.os.IPowerManager.acquireWakeLock	nusku.ermacv2.apk

Queries the unique device ID (IMEI, MEID, IMSI) 1 TTPs
discovery

System Network Configuration Discovery
T1422
Reads information about phone network operator. 1 TTPs
discovery

System Network Configuration Discovery
T1422

Requests disabling of battery optimizations (often used to enable hiding in the background). 1 TTPs 1 IoCs

evasion

User Evasion

T1628.002

description	ioc	Process
Intent action	android.settings.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS	nusku.ermacv2.apk

Uses Crypto APIs (Might try to encrypt user data) 1 IoCs

description	ioc	Process
Framework API call	javax.crypto.Cipher.doFinal	nusku.ermacv2.apk

nusku.ermacv2.apk
1⤵
- Makes use of the framework's Accessibility service
- Removes its main activity from the application launcher
- Checks CPU information
- Checks memory information
- Makes use of the framework's foreground persistence service
- Acquires the wake lock
- Requests disabling of battery optimizations (often used to enable hiding in the background).
- Uses Crypto APIs (Might try to encrypt user data)
PID:4417