Analysis

  • custom tags

    c2dropperexfiltrationobfuscatedotpoverlaysmsspywarestealer
  • max time kernel
    149s
  • max time network
    153s
  • platform
    android-11_x64
  • resource
    android-x64-arm64-20260325-en
  • resource tags

    arch:armarch:arm64arch:x64arch:x86image:android-x64-arm64-20260325-enlocale:en-usos:android-11-x64system
  • submitted
    17/08/2026, 03:21

General

  • Target
    1_f5558645c8.apk
  • Size 9.4MB
  • Sample260817-dwp5eahc32
  • SHA256 8daf9ed069291b148847ebf8ddb01d6e5dfa32ddc13117497cb94362e9e222b8
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • octo

C2
  • https://7eeebb003348a6a550345107e015af3b.com

DES_key
AES_key
AES_key

Signatures

  • Family: Octo

    Octo is a banking malware with remote access capabilities first seen in April 2022.

  • Octo payload 1 IoCs
  • Accessibility-driven UI automation to self-grant permissions 1 IoCs

    Locates nodes in the Settings or package-installer user interface by text or view identifier and dispatches synthetic clicks. This lets the application approve its own permission dialogs, complete side-loading, and intercept attempts to reach the uninstall screen without any real user consent.

  • Android SMS interception and OTP exfiltration 1 IoCs

    Registers a high-priority SMS_RECEIVED receiver, parses inbound message bodies and aborts the broadcast to hide messages from the user, alongside network exfiltration primitives. This is the standard 2FA/OTP theft pattern used to complete fraudulent transactions.

  • Android banker: accessibility service abuse with overlay injection 1 IoCs

    DEX references AccessibilityService event hooks together with window-overlay creation and credential-capture primitives. This combination is the canonical Android banking-trojan pattern: the app reads screen content and injects fake login windows over legitimate banking apps.

  • Boot-triggered restart with disguised foreground service 1 IoCs

    Restarts itself on device boot and holds a foreground service with a low-visibility notification channel, keeping the process alive across reboots and outside normal background limits. Malicious use is distinguished by pairing this with surveillance or remote-control primitives.

  • Contact harvesting with SMS self-propagation 1 IoCs

    Reads the device contact list and sends messages to the retrieved numbers, the distribution mechanism behind SMS worm campaigns. The victim's own address book becomes the delivery channel, which is why these campaigns spread rapidly within a region.

  • Keylogging via accessibility text-change events 1 IoCs

    Subscribes to text-change and view-focus accessibility events and reads the text of nodes belonging to other applications, capturing everything typed on the device including passwords entered into unrelated apps. Password-field flags are typically inspected so credential entry can be prioritised.

  • Notification listener abuse for OTP and message theft 1 IoCs

    Binds a notification listener service and reads posted notification content, optionally dismissing notifications afterwards to hide them. This harvests one-time passcodes and private messages without ever requesting SMS permissions, which is why it has largely replaced SMS interception in modern ban

  • Persistent WebSocket channel used for remote tasking 1 IoCs

    Bundles a WebSocket client and opens a long-lived bidirectional connection, the transport typically used by Android remote-access tooling for live command dispatch and streaming. Suspicious when paired with surveillance capabilities rather than an obvious in-app messaging feature.

  • Runtime string decryption with reflective method dispatch 1 IoCs

    Combines symmetric decryption or base64 decoding of embedded string tables with reflective class and method resolution, so sensitive API names never appear in plaintext. This defeats naive string-based detection and indicates deliberate anti-analysis engineering.

  • Scripted prompt coaching the user to enable Accessibility 1 IoCs

    Contains step-by-step instructional text walking the victim through enabling an accessibility service. Because Android deliberately makes this flow difficult, malware ships explicit coaching copy; the presence of such a script alongside an accessibility service is a strong abuse indicator.

  • Loads dropped Dex/Jar 1 TTPs 3 IoCs

    Runs executable file dropped to the device during analysis.

  • Makes use of the framework's Accessibility service 4 TTPs 2 IoCs

    Retrieves information displayed on the phone screen using AccessibilityService.

  • Queries a list of all the installed applications on the device (Might be used in an attempt to overlay legitimate apps) 1 TTPs
  • Queries the phone number (MSISDN for GSM devices) 1 TTPs
  • Acquires the wake lock 1 IoCs
  • 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.

  • Performs UI accessibility actions on behalf of the user 1 TTPs 1 IoCs

    Application may abuse the accessibility service to prevent their removal.

  • Queries the mobile country code (MCC) 1 TTPs 1 IoCs
  • Reads information about phone network operator. 1 TTPs
  • Requests enabling of the accessibility settings. 1 IoCs
  • Uses Crypto APIs (Might try to encrypt user data) 1 TTPs 1 IoCs

Processes

  • com.etrim75_modem
    1⤵
    • Loads dropped Dex/Jar
    • Makes use of the framework's Accessibility service
    • Acquires the wake lock
    • Makes use of the framework's foreground persistence service
    • Performs UI accessibility actions on behalf of the user
    • Queries the mobile country code (MCC)
    • Requests enabling of the accessibility settings.
    • Uses Crypto APIs (Might try to encrypt user data)
    PID:4909

Network

        MITRE ATT&CK Mobile v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        .global.com.etrim75_modem

        • Path /data/data/com.etrim75_modem/.global.com.etrim75_modem
        • Size 48B
        • SHA256 b66c1320cb063a1d391c94273572ea6edae76c8c8b0a07f8d75c88686f0df72a
        • MD5 SHA1 SHA512

        classes.dex

        • Path /data/data/com.etrim75_modem/app_dex/classes.dex
        • Size 1KB
        • SHA256 bb7b12b45dd6568815b192ea10d7805446e62cc248e6cc65ceb1e4f385c6ff72
        • MD5 SHA1 SHA512 TLSH

        classes.dex

        • Path /data/data/com.etrim75_modem/cache/classes.dex
        • Size 1KB
        • SHA256 7b587755b69a6f1d36336ddfe23cc8ebefb5fbc91bdb886d8177e437e6fd8abc
        • MD5 SHA1 SHA512 TLSH

        classes.zip

        • Path /data/data/com.etrim75_modem/cache/classes.zip
        • Size 1KB
        • SHA256 eb0ef7a3fdb6ce739fe6038dd0945f2b145c05ab3da8b31659238be9f681e394
        • MD5 SHA1 SHA512 TLSH

        .r

        • Path /data/data/com.etrim75_modem/files/.r
        • Size 322KB
        • SHA256 c5684e792d1ebefea6aac09fed45911703fd58c899f8a08133d49dd91429a820
        • MD5 SHA1 SHA512 SSDEEP TLSH
        • Path /data/data/com.etrim75_modem/oat/x86_64/[email protected]
        • Size 858B
        • SHA256 84c58c73e4a6d04ac5bbe53e376d994373243cdee19c0411c9096791acb77918
        • MD5 SHA1 SHA512 TLSH
        • Path /data/user/0/com.etrim75_modem/[email protected]
        • Size 528KB
        • SHA256 c09f1969af251be543dc24052b80b63ad1fa20b94cbdcd863de213037b686fd1
        • MD5 SHA1 SHA512 SSDEEP TLSH