ermac | 92efae55f6758e458e254cf55f977a091a9f00d2de29356affcabd7d66cc3936

Analysis

max time kernel
29s
max time network
31s
platform
android-9_x86
resource
android-x86-arm-20240910-en
resource tags

arch:armarch:x86image:android-x86-arm-20240910-enlocale:en-usos:android-9-x86system
submitted
21/03/2025, 18:08

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General

Target

base.apk
Size

3.0MB
MD5

8b6a53b48823e12738fda22b9ec295d9
SHA1

e8ae1ea55c4300f75a07db1ea6cfd47983a3f6e3
SHA256

7d9b91c228c4d0e295aedc758dcd08203d13fc378cfd8ac0547cd25d3389e024
SHA512

80601f4617854afd0616e5d7f7d906b34701ae8b28eaa69af76e05d591da5d637208cf88e1faf2dca05b3cec8bd6a80bb4eea55970427d1e85ddfcaaba064c56
SSDEEP

49152:OhxvXJeZNXngZwn3IteqH2+ysdT0+XkoZhYVAqaf8OpY790B3TK8Fg/P9lETYvF3:OhhXJeZZgwIPdPkoZLfDrBBgn9lE6flh

Score

10^/10

ermac hook banker collection credential_access defense_evasion discovery evasion execution impact infostealer persistence rat trojan

Malware Config

Extracted

Family

ermac

AES_key

Extracted

Family

hook

AES_key

Signatures

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

Ermac2 payload 2 IoCs

resource	yara_rule
behavioral4/memory/4366-0.dex	family_ermac2
behavioral4/memory/4341-0.dex	family_ermac2

Hook
Hook is an Android malware that is based on Ermac with RAT capabilities.
rat trojan infostealer hook
Hook family
hook

Loads dropped Dex/Jar 1 TTPs 2 IoCs

Runs executable file dropped to the device during analysis.

evasion

Download New Code at Runtime

T1407

ioc	pid	Process
/data/user/0/com.tencent.mm/app_DynamicOptDex/UtOjp.json	4366	/system/bin/dex2oat --instruction-set=x86 --instruction-set-features=ssse3,-sse4.1,-sse4.2,-avx,-avx2,-popcnt --runtime-arg -Xhidden-api-checks --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=x86 --instruction-set-features=default --inline-max-code-units=0 --compact-dex-level=none --dex-file=/data/user/0/com.tencent.mm/app_DynamicOptDex/UtOjp.json --output-vdex-fd=41 --oat-fd=42 --oat-location=/data/user/0/com.tencent.mm/app_DynamicOptDex/oat/x86/UtOjp.odex --compiler-filter=quicken --class-loader-context=&
/data/user/0/com.tencent.mm/app_DynamicOptDex/UtOjp.json	4341	com.tencent.mm

Makes use of the framework's Accessibility service 4 TTPs 3 IoCs

Retrieves information displayed on the phone screen using AccessibilityService.

collection defense_evasion credential_access

Input Injection

T1516

Screen Capture

T1513

Keylogging

T1417.001

GUI Input Capture

T1417.002

description	ioc	Process
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfoByAccessibilityId	com.tencent.mm
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByText	com.tencent.mm
Framework service call	android.accessibilityservice.IAccessibilityServiceConnection.findAccessibilityNodeInfosByViewId	com.tencent.mm

Queries information about running processes on the device 1 TTPs 1 IoCs

Application may abuse the framework's APIs to collect information about running processes on the device.

discovery

Process Discovery

T1424

description	ioc	Process
Framework service call	android.app.IActivityManager.getRunningAppProcesses	com.tencent.mm

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	com.tencent.mm

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.

defense_evasion persistence

Foreground Persistence

T1541

description	ioc	Process
Framework service call	android.app.IActivityManager.setServiceForeground	com.tencent.mm

Queries information about the current Wi-Fi connection 1 TTPs 1 IoCs

Application may abuse the framework's APIs to collect information about the current Wi-Fi connection.

discovery

System Network Connections Discovery

T1421

description	ioc	Process
Framework service call	android.net.wifi.IWifiManager.getConnectionInfo	com.tencent.mm

Queries the mobile country code (MCC) 1 TTPs 1 IoCs

discovery

System Network Configuration Discovery

T1422

description	ioc	Process
Framework service call	com.android.internal.telephony.ITelephony.getNetworkCountryIsoForPhone	com.tencent.mm

Reads information about phone network operator. 1 TTPs
discovery

System Network Configuration Discovery
T1422

Registers a broadcast receiver at runtime (usually for listening for system events) 1 TTPs 1 IoCs

persistence

Broadcast Receivers

T1624.001

description	ioc	Process
Framework service call	android.app.IActivityManager.registerReceiver	com.tencent.mm

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.

execution persistence

Scheduled Task/Job

T1603

description	ioc	Process
Framework service call	android.app.job.IJobScheduler.schedule	com.tencent.mm

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

impact

Data Encrypted for Impact

T1471

description	ioc	Process
Framework API call	javax.crypto.Cipher.doFinal	com.tencent.mm

Checks CPU information 2 TTPs 1 IoCs

System Checks

T1633.001

System Information Discovery

T1426

description	ioc	Process
File opened for read	/proc/cpuinfo	com.tencent.mm

Checks memory information 2 TTPs 1 IoCs

System Checks

T1633.001

System Information Discovery

T1426

description	ioc	Process
File opened for read	/proc/meminfo	com.tencent.mm

com.tencent.mm
1⤵
- Loads dropped Dex/Jar
- Makes use of the framework's Accessibility service
- Queries information about running processes on the device
- Acquires the wake lock
- Makes use of the framework's foreground persistence service
- Queries information about the current Wi-Fi connection
- Queries the mobile country code (MCC)
- Registers a broadcast receiver at runtime (usually for listening for system events)
- Schedules tasks to execute at a specified time
- Uses Crypto APIs (Might try to encrypt user data)
- Checks CPU information
- Checks memory information
PID:4341
- /system/bin/dex2oat --instruction-set=x86 --instruction-set-features=ssse3,-sse4.1,-sse4.2,-avx,-avx2,-popcnt --runtime-arg -Xhidden-api-checks --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=x86 --instruction-set-features=default --inline-max-code-units=0 --compact-dex-level=none --dex-file=/data/user/0/com.tencent.mm/app_DynamicOptDex/UtOjp.json --output-vdex-fd=41 --oat-fd=42 --oat-location=/data/user/0/com.tencent.mm/app_DynamicOptDex/oat/x86/UtOjp.odex --compiler-filter=quicken --class-loader-context=&
  2⤵
  - Loads dropped Dex/Jar
  PID:4366

Network

MITRE ATT&CK Mobile v15

Initial Access

Execution

Scheduled Task/Job

T1603

Persistence

Event Triggered Execution

T1624

Broadcast Receivers

T1624.001

Foreground Persistence

T1541

Scheduled Task/Job

T1603

Privilege Escalation

Defense Evasion

Download New Code at Runtime

T1407

Foreground Persistence

T1541

Input Injection

T1516

Virtualization/Sandbox Evasion

T1633

System Checks

T1633.001

Credential Access

Input Capture

T1417

GUI Input Capture

T1417.002

Keylogging

T1417.001

Discovery

Process Discovery

T1424

System Information Discovery

T1426

System Network Configuration Discovery

T1422

System Network Connections Discovery

T1421

Lateral Movement

Collection

Input Capture

T1417

GUI Input Capture

T1417.002

Keylogging

T1417.001

Screen Capture

T1513

Command and Control

Exfiltration

Impact

Data Encrypted for Impact

T1471

Input Injection

T1516

Replay Monitor

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Downloads

/data/data/com.tencent.mm/app_DynamicOptDex/UtOjp.json

Filesize
701KB

MD5
5d9ec9f68a6fe8bff7fa50fd9c274990

SHA1
e7d07ac6b7420b915d4fcc7e8747b121546dd25e

SHA256
da09dd25863b05fe42374ed097e03c7389863e8055ae3dc4e76ab8f15872a857

SHA512
478fdf77077f5b36c00d7186d5d763f47e087541052e44987603a8127f412d364254e7e916f5e1e2cd59a66c9c6870858f648753f97b385300272ae8e8bb4863

Download Submit
/data/data/com.tencent.mm/app_DynamicOptDex/UtOjp.json

Filesize
701KB

MD5
22540a5ce619d354e887f56be5c1c80a

SHA1
3435a052cae65e5fee2c5ba2873486895358ba94

SHA256
92bbe794951fd6b0c3159ad843337b9e4fd2fcb727cfa1dbe7e358e3f0729316

SHA512
d9c39c57c58cda3ea22a8d64ca876107b08eef4f9b7f059c1a86250c15d56bd1cdc82adbbab2ba2ef975f4efc822e29755dfae659b703c5e0872d342613a979d

Download Submit
/data/data/com.tencent.mm/no_backup/androidx.work.workdb

Filesize
4KB

MD5
f2b4b0190b9f384ca885f0c8c9b14700

SHA1
934ff2646757b5b6e7f20f6a0aa76c7f995d9361

SHA256
0a8ffb6b327963558716e87db8946016d143e39f895fa1b43e95ba7032ce2514

SHA512
ec12685fc0d60526eed4d38820aad95611f3e93ae372be5a57142d8e8a1ba17e6e5dfe381a4e1365dddc0b363c9c40daaffdc1245bd515fddac69bf1abacd7f1

Download Submit
/data/data/com.tencent.mm/no_backup/androidx.work.workdb-journal

Filesize
512B

MD5
4177cdfc5ccd72bf97d1848a31c5dd30

SHA1
f175a94cbad246e84a2c08196d11d24f514592c6

SHA256
081a74c59198d0d49cf6edc448f7e93e88b08b999340950bd1dd9c5dbf74f338

SHA512
3991f56e73056ca43f0e44285e88fc701c02ae153f30d48a2dd9a0a8cae2f437cb634714096611a71c15644c27ec6c9fe27c8d401129166d0d3ae671b60da546

Download Submit
/data/data/com.tencent.mm/no_backup/androidx.work.workdb-shm

Filesize
32KB

MD5
bb7df04e1b0a2570657527a7e108ae23

SHA1
5188431849b4613152fd7bdba6a3ff0a4fd6424b

SHA256
c35020473aed1b4642cd726cad727b63fff2824ad68cedd7ffb73c7cbd890479

SHA512
768007e06b0cd9e62d50f458b9435c6dda0a6d272f0b15550f97c478394b743331c3a9c9236e09ab5b9cb3b423b2320a5d66eb3c7068db9ea37891ca40e47012

Download Submit
/data/data/com.tencent.mm/no_backup/androidx.work.workdb-wal

Filesize
108KB

MD5
4a603b36b0cfe8658056d47f383b0c41

SHA1
17f133b07201749bf5fd2cb5870db7581964c97b

SHA256
501374bab6a7caed3fe6847ee62f637e27fe75f6c77bba553006fe47c8d2efe6

SHA512
58417671a98285b3edf145613c52fd51721b50743cb5b0632b54e77824cd2cdef48ab8202f185a61f9e74d3661472b2bb341668748e342bbafe9dcb17c75094d

Download Submit
/data/data/com.tencent.mm/no_backup/androidx.work.workdb-wal

Filesize
173KB

MD5
0fcec8f1b848ca8f790e111a9fb8226d

SHA1
fb4e2d341d3c2cc6839bea2f16abe761b14459eb

SHA256
2f94947cf99fd064ba316f05c5e59f47bf08110c1e332b3fe1c39fcead0593a9

SHA512
f88b45e167da44492f33975858270af2b347bce25e3e83dc8b80a746140058959524f82b26c011b707e8bd267b33220571387e0a771d802006b68d5658aa806c

Download Submit
/data/data/com.tencent.mm/no_backup/androidx.work.workdb-wal

Filesize
16KB

MD5
ceca0a55c901709fded845d2ba8f4ea0

SHA1
61d1dd2a9261f51465b432116d18819d65518ba2

SHA256
ae2a9df80eb8a9159a30c6c80894ac59f9c0fdb265bc7e84c0a378f512fcbf00

SHA512
ed2d9797ad3bb28fd96ec8cd852e9e57e4ea8d65576f56eba6a19218ccfb49b86b4c062bd052ad787af15b6adc14b0717e3fa1d688bb9af355883575eb15c4ea

Download Submit
/data/user/0/com.tencent.mm/app_DynamicOptDex/UtOjp.json

Filesize
1.5MB

MD5
24018baf8861fc01287da35ad974daf7

SHA1
0ebcdabda6181bbbf2f78e0839d5a825fd067fa2

SHA256
9b8334cbb33fabfe269c7f1d428f662eeee5376b7529d2793aaf0b71a8d6aa4b

SHA512
ff550317940d1fd72418e06a9831b2915ef6ea8ddbffc5943147f5591dcc180a7267a2c3c43168216c0d819bca70f560e36c9151d1649108861d49e10611427e

Download Submit
/data/user/0/com.tencent.mm/app_DynamicOptDex/UtOjp.json

Filesize
1.5MB

MD5
3355d4deb3f92bf0415a6de693fa3185

SHA1
f3c372743fc67f824a563a8d1163c6c3273b56e3

SHA256
d015f9c46cc1294c7bd8d84280803aad1daad3e2038a10f781dcbca655faa4c8

SHA512
2be9bf19a171e58c8f944490559cc02ae8ad606efcaad8f581d7e8064129c7d424f253e903e5dc5cd4fecf035689486df08c55088b6529dd7a8161ad2ee62fae

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Mobile v15

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Downloads