Analysis
- custom tags
c2dropperexfiltrationobfuscatedotpoverlaysmsspywarestealer - max time kernel
146s - max time network
152s - 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
19/08/2026, 01:13
Static task
static1
Behavioral task
behavioral1
Sample
fce8298e4849d80d2191f1a9cf430fee0de57c6448501f544b17a0ce7c1f01d4.apk
Resource
android-x64-arm64-20260325-en
General
- Target fce8298e4849d80d2191f1a9cf430fee0de57c6448501f544b17a0ce7c1f01d4.apk
- Size 1.1MB
- Sample260819-bk68facd43
- SHA256 fce8298e4849d80d2191f1a9cf430fee0de57c6448501f544b17a0ce7c1f01d4
- MD5 f459cec769d8801a401d7d14b589c42f
- SHA1 005a46930f0416f624e861470b3602f4a793df1f
- SHA512 7fc561a8fd71e1893447e7698bb0dd30668401c255fdd51543c2d305fe4ca36a162dd8f44e0c008e4ebd8babba9e3f7e5bb00949e9e443ed5c4d680eab3cd743
- SSDEEP 24576:8onBcEvkrXruX+kJ84Wh8HhKoIxASRS7KoDtxUupK1qlCNGfh6/UUK:8UcEvmXCOeto8HA6+O3pKUCEfhyfK
- TLSH T104451242F3C8C612F4AE6B384C6B92E5A6307E81CB0152673A85735D49B27D4CE27B77
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Extracted
-
octo
-
https://64.89.163.37/ZWFlY2Q1NjdmZmI3/
-
https://46.151.182.213/ZWFlY2Q1NjdmZmI3/
-
https://a93f6d2b7SDSGx0k1m9q4r8s5v.com/ZWFlY2Q1NjdmZmI3/
-
https://h6d23bsdgsdsgsd8d7f1qk4m5x.com/ZWFlY2Q1NjdmZmI3/
-
https://5f46236sdgagjkkfhfhdxzh1k9m8s7q4x.com/ZWFlY2Q1NjdmZmI3/
-
https://34g9s7b6sdgjkkjkhjkgdsg0f6k1m8q5x.com/ZWFlY2Q1NjdmZmI3/
-
https://344d9g3sdgsgs8d1kjhjfjghdkhk7m5f2x.com/ZWFlY2Q1NjdmZmI3/
-
https://54sdf7sdskjjghgfkmdg3b6a0d1k9m8q.com/ZWFlY2Q1NjdmZmI3/
Extracted
-
octo
-
https://64.89.163.37/ZWFlY2Q1NjdmZmI3/
-
https://46.151.182.213/ZWFlY2Q1NjdmZmI3/
-
https://a93f6d2b7SDSGx0k1m9q4r8s5v.com/ZWFlY2Q1NjdmZmI3/
-
https://h6d23bsdgsdsgsd8d7f1qk4m5x.com/ZWFlY2Q1NjdmZmI3/
-
https://5f46236sdgagjkkfhfhdxzh1k9m8s7q4x.com/ZWFlY2Q1NjdmZmI3/
-
https://34g9s7b6sdgjkkjkhjkgdsg0f6k1m8q5x.com/ZWFlY2Q1NjdmZmI3/
-
https://344d9g3sdgsgs8d1kjhjfjghdkhk7m5f2x.com/ZWFlY2Q1NjdmZmI3/
-
https://54sdf7sdskjjghgfkmdg3b6a0d1k9m8q.com/ZWFlY2Q1NjdmZmI3/
Signatures
- Family: Octo
Octo is a banking malware with remote access capabilities first seen in April 2022.
- Octo payload 1 IoCs
resource yara_rule behavioral1/files/fstream-1.dat 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 behavioral1/files/fstream-1.dat ANDROID_Accessibility_AutoClick_SelfGrant - 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 behavioral1/files/fstream-1.dat ANDROID_Overlay_Banker_AccessibilityAbuse - 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 behavioral1/files/fstream-1.dat ANDROID_Contacts_SMS_Propagation - 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 behavioral1/files/fstream-1.dat 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 behavioral1/files/fstream-1.dat 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 behavioral1/files/fstream-1.dat ANDROID_Obfuscation_EncryptedStrings_Reflection - Silent screen capture via MediaProjection 1 IoCs
Acquires a MediaProjection session and pipes the virtual display into an image reader or encoder, enabling continuous capture of everything shown on screen including credentials and one-time codes. Combined with accessibility auto-approval this runs without further user interaction.
resource yara_rule behavioral1/files/fstream-1.dat ANDROID_MediaProjection_ScreenCapture - Loads dropped Dex/Jar 1 TTPs 2 IoCs
Runs executable file dropped to the device during analysis.
ioc pid Process /data/user/0/com.rivertogether97/cache/bqtknrmlryvvyd 4693 com.rivertogether97 /data/user/0/com.rivertogether97/cache/bqtknrmlryvvyd 4693 com.rivertogether97 - 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.rivertogether97 Framework service call android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId com.rivertogether97 - 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.rivertogether97 - 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.rivertogether97 - Queries the mobile country code (MCC) 1 TTPs 1 IoCs
description ioc Process Framework service call com.android.internal.telephony.ITelephony.getNetworkCountryIsoForPhone com.rivertogether97 - Reads information about phone network operator. 1 TTPs
- Schedules tasks to execute at a specified time 1 TTPs 1 IoCs
Application may abuse the framework's APIs to perform task scheduling for initial or recurring execution of malicious code.
description ioc Process Framework service call android.app.job.IJobScheduler.schedule com.rivertogether97 - Uses Crypto APIs (Might try to encrypt user data) 1 TTPs 1 IoCs
description ioc Process Framework API call javax.crypto.Cipher.doFinal com.rivertogether97
Processes
-
com.rivertogether971⤵
- 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
- Queries the mobile country code (MCC)
- Schedules tasks to execute at a specified time
- Uses Crypto APIs (Might try to encrypt user data)
PID:4693
Network
MITRE ATT&CK Mobile v16
Defense Evasion
Download New Code at Runtime
1Foreground Persistence
1Input Injection
1Discovery
Software Discovery
1Security Software Discovery
1System Network Configuration Discovery
3Replay Monitor
Loading Replay Monitor...
Downloads
- Path /data/data/com.rivertogether97/cache/bqtknrmlryvvyd
- Size 1013KB
- SHA256 11a9f34421861e53de65edffe96043417c2bfc713ef2758ec8b7d23a2666054e
- MD5 bc13e0daded11efb52a50d7e505608b4
- SHA1 8a7822b4b033bf03bc978dfa4b2dcd23e4bcac31
- SHA512 929fc53ec3945e34438a4cdec36d11681179e4dc15df7a146e9e5dcc93110086045e0019d9b4189abb76bb021260d395f3bf80e54dc9303c23819e8ad5fd2ff0
- SSDEEP 12288:QZKVoUnPA/CSup6civtNxwQw1mArNEQGULW9e4paDwbi7UOs3N2p52+gvfU3Msz+:Qjcifi2JGp52tfU3Msz5khie
- TLSH T1C2258ED796825FA7DD3867382CE217003335A48A2F63470BC959DAF95C472E6AFD4388
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path /data/data/com.rivertogether97/cache/oat/bqtknrmlryvvyd.cur.prof
- Size 1KB
- SHA256 fcb1cc83cdc4a1df53c33c8b8acc2ac35c4fae4c49279bb7d1919bb6921d73d4
- MD5 58363e7dde48195fd59119a0d28ccbb2
- SHA1 ef41029c59638c89f1c59b3fdc05fcd32bc645ab
- SHA512 ce86b8b9d8ea489a7c9b8bc6308fedd627c2be9117cfa4701a2d4355e6918524c55b2b8a637e5ad80cf0e864ab628b13c85c6fcd187f10c1eb2c5948f579793b
- TLSH T117310BB6C40DD72E8303C298106B1BCE5B96A56B878E76881A671DC8D7741DC582A0F2
- MD5 SHA1 SHA512 TLSH