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
Behavioral task
behavioral1
Sample
7bb9d049ebd45bfc84e68d03db315f003d040af4a3856315ca75c5166a34503e.apk
Resource
android-x86-arm-20260325-en
Behavioral task
behavioral2
Sample
7bb9d049ebd45bfc84e68d03db315f003d040af4a3856315ca75c5166a34503e.apk
Resource
android-x64-20260325-en
Behavioral task
behavioral3
Sample
7bb9d049ebd45bfc84e68d03db315f003d040af4a3856315ca75c5166a34503e.apk
Resource
android-x64-arm64-20260325-en
Behavioral task
behavioral4
Sample
1_f5558645c8.apk
Resource
android-x64-arm64-20260325-en
General
- Target 1_f5558645c8.apk
- Size 9.4MB
- Sample260817-dwp5eahc32
- SHA256 8daf9ed069291b148847ebf8ddb01d6e5dfa32ddc13117497cb94362e9e222b8
- MD5 b85f43c7ed38d7217e7413a5661bdb6c
- SHA1 0b9915c68c173f461f2356145c19abf269b0e120
- SHA512 efe8e97d8370827db2886331fe2d27b18d1d065bd7d08c04f1d68c31de9a397ea6c066d89fa587a788f69673166182da67f092dd1fb2b4eb4f1cd4728a9c7d62
- SSDEEP 98304:zk3tooj7GVKwC5iSRGAPRsGFa7Bdn+p0PIfEiLRTLs94dy2A4P7dTRBVLlnlwnWT:g3t/j7GU7rNRY7T5iZIS5V7hRBHlZ
- TLSH T163A6C01777864F39F88D7934814F13378513B91967A151DB096BC100EE2EBF2AEB9B82
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Extracted
-
octo
-
https://7eeebb003348a6a550345107e015af3b.com
Signatures
- Family: Octo
Octo is a banking malware with remote access capabilities first seen in April 2022.
- Octo payload 1 IoCs
resource yara_rule behavioral4/memory/4909-2.dex family_octo - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_Accessibility_AutoClick_SelfGrant - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_SMS_OTP_Interception - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_Overlay_Banker_AccessibilityAbuse - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_Persistence_BootForegroundService - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_Contacts_SMS_Propagation - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_Keylogger_AccessibilityTextCapture - 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
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_NotificationListener_OTP_Theft - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_WebSocket_C2_Channel - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_Obfuscation_EncryptedStrings_Reflection - 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.
resource yara_rule behavioral4/memory/4909-2.dex ANDROID_Accessibility_SocialEngineering_Prompt - Loads dropped Dex/Jar 1 TTPs 3 IoCs
Runs executable file dropped to the device during analysis.
ioc pid Process /data/user/0/com.etrim75_modem/app_dex/classes.dex 4909 com.etrim75_modem /data/user/0/com.etrim75_modem/app_dex/classes.dex 4909 com.etrim75_modem /data/user/0/com.etrim75_modem/[email protected] 4909 com.etrim75_modem - Makes use of the framework's Accessibility service 4 TTPs 2 IoCs
Retrieves information displayed on the phone screen using AccessibilityService.
description ioc Process Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfoByAccessibilityId com.etrim75_modem Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId com.etrim75_modem - 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
description ioc Process Framework service call android.os.IPowerManager.acquireWakeLock com.etrim75_modem - 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.
description ioc Process Framework service call android.app.IActivityManager.setServiceForeground com.etrim75_modem - Performs UI accessibility actions on behalf of the user 1 TTPs 1 IoCs
Application may abuse the accessibility service to prevent their removal.
ioc Process android.accessibilityservice.IAccessibilityServiceConnection.performGlobalAction com.etrim75_modem - Queries the mobile country code (MCC) 1 TTPs 1 IoCs
description ioc Process Framework service call com.android.internal.telephony.ITelephony.getNetworkCountryIsoForPhone com.etrim75_modem - Reads information about phone network operator. 1 TTPs
- Requests enabling of the accessibility settings. 1 IoCs
description ioc Process Intent action android.settings.ACCESSIBILITY_SETTINGS com.etrim75_modem - Uses Crypto APIs (Might try to encrypt user data) 1 TTPs 1 IoCs
description ioc Process Framework API call javax.crypto.Cipher.doFinal com.etrim75_modem
Processes
-
com.etrim75_modem1⤵
- 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
Defense Evasion
Download New Code at Runtime
1Foreground Persistence
1Impair Defenses
1Prevent Application Removal
1Input Injection
1Discovery
Software Discovery
1Security Software Discovery
1System Network Configuration Discovery
3Replay Monitor
Loading Replay Monitor...
Downloads
- Path /data/data/com.etrim75_modem/.global.com.etrim75_modem
- Size 48B
- SHA256 b66c1320cb063a1d391c94273572ea6edae76c8c8b0a07f8d75c88686f0df72a
- MD5 046a414913add6f5bb60072c7db819b6
- SHA1 451ee4f6809260aec622d772fd329c7d0297a842
- SHA512 4e6355f3051ed5e811ab030abde1f5be7f5e1cf33be99cd08477e9b6c015deb1d8bd75a09fb9c7176b8511c5ad0a67abc0902a3531e97564ccb6afc57496a47c
- MD5 SHA1 SHA512
- Path /data/data/com.etrim75_modem/app_dex/classes.dex
- Size 1KB
- SHA256 bb7b12b45dd6568815b192ea10d7805446e62cc248e6cc65ceb1e4f385c6ff72
- MD5 96420503b20fa39fad10cef4e264ee81
- SHA1 f182b9804cec5d4e8d0e2b0f9157d40b2b79ea9c
- SHA512 82f99566d0eca7f78e21647f0ea19e0ae4e5ac559dc57f91699e76c0b7bf65a602177392a8dd0902d5fa752d996a6e2342e3149674cef2fa211655e5203c6ade
- TLSH T17B31136BFF91D713D9FE933CA1BE0701A33591645B02C71B475A686139C23604AD7AC9
- MD5 SHA1 SHA512 TLSH
- Path /data/data/com.etrim75_modem/cache/classes.dex
- Size 1KB
- SHA256 7b587755b69a6f1d36336ddfe23cc8ebefb5fbc91bdb886d8177e437e6fd8abc
- MD5 b1b06260dd74f90b6d81d4b0f4396deb
- SHA1 c9c6bbb17e07ca89424ee72f9f07e7de64e4995d
- SHA512 ce0edc4603a9a8921db5cd313d3b4ce1da1f06b0e7188da87fdca585775e5d9469d85f1677e59bf3c3a8026af9d5065e184b3cce819d8f7393836b1e81701e27
- TLSH T1F311B982C9B17270D0249934CA7962F71B617FD4251B6BD379F50D118A46C1C632F3F5
- MD5 SHA1 SHA512 TLSH
- Path /data/data/com.etrim75_modem/cache/classes.zip
- Size 1KB
- SHA256 eb0ef7a3fdb6ce739fe6038dd0945f2b145c05ab3da8b31659238be9f681e394
- MD5 9dd70b5be53caa1e8f3e18f143eb4a5e
- SHA1 166e4ca99d1b7d582dea51e79093fc5183c6fd37
- SHA512 325a6827a5bd7168cf83051f38cd8cbe5dc2f3dcf1f9fe427e07c96a2a10b74d28934dbb4b88ef4b0d33ff28ac292cf3a02ef568f60662c6b4d46191a1ff97d5
- TLSH T1C621D746C9F13270C0385A31C6A562B31B617FD821176B8269F809118903C2C171E2B5
- MD5 SHA1 SHA512 TLSH
- Path /data/data/com.etrim75_modem/files/.r
- Size 322KB
- SHA256 c5684e792d1ebefea6aac09fed45911703fd58c899f8a08133d49dd91429a820
- MD5 77dc50489b9323274732d27dc8a4e803
- SHA1 0e02a3595b62489d0739d771881da8604d117c65
- SHA512 0684a92f3e9c525384cfa53f531afba61e5930e1c27032a7e27e3315f72761b62e122dc34768d8162ba08f9bed53d148aa8dc034b46456bdd211f230637eba58
- SSDEEP 6144:YQFtaOYui6AZTh0bOTgoCD0i09L/B64OGNTWEKnh7DNoAFFQqbszkLsJhUj6Q+x8:YRQ+xt/iASes
- TLSH T1F7643C62F695082EDCA69D3C934FB271E720B894935591DB07D0A6203E5BAE5CF3CED0
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path /data/data/com.etrim75_modem/oat/x86_64/[email protected]
- Size 858B
- SHA256 84c58c73e4a6d04ac5bbe53e376d994373243cdee19c0411c9096791acb77918
- MD5 6adea75980f2f9afdd877afe1bd4b6ad
- SHA1 f6b8d7f57b4c068cd22444109dcc9d7bea2e9c02
- SHA512 054fe6aa60deb991569586fbdec1cd7d03d29d1fda5765bc91c2d6c8c6d5093b552dd88fa7f299f59b1ab8294696bac20d606d54c811238f5bb57f2ff9ae3a90
- TLSH T157110A51278C0C518B768A795761A40333DF2D92E5258A94EFF206F53BAE9683CC2D1E
- MD5 SHA1 SHA512 TLSH
- Path /data/user/0/com.etrim75_modem/[email protected]
- Size 528KB
- SHA256 c09f1969af251be543dc24052b80b63ad1fa20b94cbdcd863de213037b686fd1
- MD5 8c171b97b06968e41188914eb68052be
- SHA1 00a456f27c4e6b4b0bdb0f28b130044ccbe44941
- SHA512 ea0d71991d111c15de9f869a3f7fce8a787d4a74f585d7cd73dae39d5ad2151918b4927014900458c0094b4ad104de6e5e3c84e143c1d00c8653448c1519b11c
- SSDEEP 12288:7IezQQkSEzosMEhoGhC4px2mLZrLvcXCoB//jUQt:9EQkSEzeG12KZaCuz
- TLSH T19DB43982A4918F27E46F933951FB4B30B33769C64703CB47D144B6BAAF837D52AC9489
- MD5 SHA1 SHA512 SSDEEP TLSH