Malware Analysis Report

2024-10-24 20:58

Sample ID 240808-mlz2aswdld
Target KrinkoOp.apk
SHA256 26f0a9ba3832d464e2b26ad4f30b0e431221fbb99081ec0c833fa00976446023
Tags
spynote persistence collection credential_access evasion execution
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Mobile Matrix V15

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 Overview

score
10/10

SHA256

26f0a9ba3832d464e2b26ad4f30b0e431221fbb99081ec0c833fa00976446023

Threat Level: Known bad

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

Malicious Activity Summary

spynote persistence collection credential_access evasion execution

Spynote family

Spynote payload

Makes use of the framework's Accessibility service

Requests dangerous framework permissions

Makes use of the framework's foreground persistence service

Declares broadcast receivers with permission to handle system events

Declares services with permission to bind to the system

Acquires the wake lock

Attempts to obfuscate APK file format

Schedules tasks to execute at a specified time

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

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-08 10:33

Signatures

Spynote family

spynote

Spynote payload

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

Attempts to obfuscate APK file format

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
Required by VPN services to bind with the system. Allows apps to provision VPN services. android.permission.BIND_VPN_SERVICE N/A N/A
Required by input method services to bind with the system. Allows apps to provide custom input methods (keyboards). android.permission.BIND_INPUT_METHOD N/A N/A

Requests dangerous framework permissions

Description Indicator Process Target
Allows an application to read from external storage. android.permission.READ_EXTERNAL_STORAGE N/A N/A
Allows an application to write to external storage. android.permission.WRITE_EXTERNAL_STORAGE N/A N/A
Allows an application to request installing packages. android.permission.REQUEST_INSTALL_PACKAGES N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-08 10:33

Reported

2024-08-08 10:35

Platform

android-x86-arm-20240624-en

Max time kernel

40s

Max time network

35s

Command Line

com.appd.instll.load

Signatures

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

Processes

com.appd.instll.load

Network

Country Destination Domain Proto
N/A 224.0.0.251:5353 udp
GB 142.250.200.42:443 tcp
US 1.1.1.1:53 semanticlocation-pa.googleapis.com udp
US 1.1.1.1:53 semanticlocation-pa.googleapis.com udp
GB 172.217.169.42:443 semanticlocation-pa.googleapis.com tcp
GB 216.58.204.78:443 tcp
US 1.1.1.1:53 android.apis.google.com udp
GB 216.58.212.206:443 android.apis.google.com tcp
GB 142.250.179.234:443 semanticlocation-pa.googleapis.com tcp

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-08 10:33

Reported

2024-08-08 10:37

Platform

android-x86-arm-20240624-en

Max time kernel

179s

Max time network

166s

Command Line

tim.hd.they

Signatures

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

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

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

Schedules tasks to execute at a specified time

execution persistence
Description Indicator Process Target
Framework service call android.app.job.IJobScheduler.schedule N/A N/A

Processes

tim.hd.they

Network

Country Destination Domain Proto
N/A 224.0.0.251:5353 udp
GB 142.250.200.42:443 tcp
US 1.1.1.1:53 semanticlocation-pa.googleapis.com udp
US 147.185.221.17:59471 tcp
GB 216.58.204.78:443 tcp
US 1.1.1.1:53 android.apis.google.com udp
GB 142.250.187.238:443 android.apis.google.com tcp
US 147.185.221.17:59471 tcp
US 147.185.221.17:59471 tcp

Files

/storage/emulated/0/Config/sys/apps/log/log-2024-08-08.txt

MD5 de2c41a51ee9246eb1708f65b511add0
SHA1 2f442d634c8a18760a232c8829d4b5d74a52f074
SHA256 ad2d914ca347cd1930e32f21c6d5448c34104bea181b93abc85ec518985653ab
SHA512 7cdfbd001594503644e9ed80ae852f90ef9e841a8382e2eec6979e149a2c400a3b83055d205b4d1d66e1600e5127482932d5127eb5800d35a4ee5673fe34d84a

/storage/emulated/0/Config/sys/apps/log/log-2024-08-08.txt

MD5 33053d22916825e664d8d30a2f82d4f3
SHA1 6ae200c9a36a3a53e4ce4cbdb49db4a147855903
SHA256 6ec1087b27195f5a7e4116cee1254df5259fb824f8683953eb427035d081957b
SHA512 52d6d1b80f32fc9a2ed9289bb103ab20b17f1b9883ab684fd851ff78da9e2e28f92c9c8599792ca7f4faecc7060df4d487d13af11614bd0a60b65a1c15d37331

/storage/emulated/0/Config/sys/apps/log/log-2024-08-08.txt

MD5 73796bbdf5efd7eb9751ebcb49a534f2
SHA1 cdae49b5d77ce9504cfa959e3c80859b5614f7cf
SHA256 3980309558e204ff9cf530ce79da2d6e72dafe5ed02a4a028cfe0d305c798df1
SHA512 d79be30e8ddb39156cfd6c28c93df8e95107a39cf92d24e43ebb83f19d419c390d0541d59af8fe35e57198ac3934e96ad60f3f637c1b0112b7722b551d8491a3

/storage/emulated/0/Config/sys/apps/log/log-2024-08-08.txt

MD5 bdb821a955117250611e94cd23842584
SHA1 81edcea1b44f94cfc140710c8410d0696b760c67
SHA256 076eb89055ff3d929eb732e1002a0105652e628682a741151388ce1df3b6ec9d
SHA512 e52ffed4ee84acc414c530c239c8876d9e99c1f2b2c7626c0ed7fbe0c59b9cb8f8a5e9e983541bea3dfdb849dd3b9593df054c2482ed8bcda7c70ebd960ca268