flawedammyy | ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a

Analysis

max time kernel
150s
max time network
144s
platform
windows10-1703_x64
resource
win10-20240221-en
resource tags

arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system
submitted
04-03-2024 10:10

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

AA_v3.exe
Size

798KB
MD5

90aadf2247149996ae443e2c82af3730
SHA1

050b7eba825412b24e3f02d76d7da5ae97e10502
SHA256

ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a
SHA512

eec32bb82b230dd309c29712e72d4469250e651449e127479d178eddbafd5a46ec8048a753bc2c1a0fdf1dc3ed72a9453ca66fb49cbf0f95a12704e5427182be
SSDEEP

24576:Uj0JJ4p/A4npt3XojeQG5EtzRtO7GvmDguXd:UjoJ4u4zojegylDN

Score

10^/10

flawedammyy bootkit persistence trojan

Malware Config

Signatures

FlawedAmmyy RAT
Remote-access trojan based on leaked code for the Ammyy remote admin software.
trojan flawedammyy

Blocklisted process makes network request 1 IoCs

Processes:

rundll32.exe

flow	pid	Process
20	2264	rundll32.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

AA_v3.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-682446400-748730298-2471801445-1000\Control Panel\International\Geo\Nation	AA_v3.exe

Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid	Process
2264	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

Processes:

AA_v3.exeAA_v3.exe

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	AA_v3.exe
File opened for modification	\??\PhysicalDrive0	AA_v3.exe

Drops file in System32 directory 13 IoCs

Processes:

AA_v3.exe

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\counters2.dat	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\103621DE9CD5414CC2538780B4B75751	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\103621DE9CD5414CC2538780B4B75751	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\5048D75D0A7E580D041342EF64D47462	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\5048D75D0A7E580D041342EF64D47462	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE	AA_v3.exe

Modifies data under HKEY_USERS 13 IoCs

Processes:

AA_v3.exe

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Ammyy\Admin	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	AA_v3.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = fe4896edec0fb10c35dad64846562d1a8a78002fa632465a77764165450a1a569e567adc4d7a5c24f3cfde6a8a002a7217c8c53b7ff54f84d823f175e4b30a413374244f	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\OnDemandInterfaceCache	AA_v3.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\1a\52C64B7E\LanguageList = 65006e002d0055005300000065006e0000000000	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	AA_v3.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

rundll32.exe

pid	Process
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe
2264	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

rundll32.exe

description	pid	Process
Token: SeLockMemoryPrivilege	2264	rundll32.exe

Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

AA_v3.exe

pid	Process
4604	AA_v3.exe
4604	AA_v3.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

AA_v3.exe

pid	Process
4604	AA_v3.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

AA_v3.exeAA_v3.exe

description	pid	Process	procid_target
PID 2628 wrote to memory of 4604	2628	AA_v3.exe	74
PID 2628 wrote to memory of 4604	2628	AA_v3.exe	74
PID 2628 wrote to memory of 4604	2628	AA_v3.exe	74
PID 4604 wrote to memory of 2264	4604	AA_v3.exe	75
PID 4604 wrote to memory of 2264	4604	AA_v3.exe	75

C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
"C:\Users\Admin\AppData\Local\Temp\AA_v3.exe"
1⤵
- Writes to the Master Boot Record (MBR)
PID:2132

C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
"C:\Users\Admin\AppData\Local\Temp\AA_v3.exe" -service -lunch
1⤵
- Suspicious use of WriteProcessMemory
PID:2628
- C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
  "C:\Users\Admin\AppData\Local\Temp\AA_v3.exe"
  2⤵
  - Checks computer location settings
  - Writes to the Master Boot Record (MBR)
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4604
- - C:\Windows\SYSTEM32\rundll32.exe
    rundll32.exe "C:\ProgramData\AMMYY\aa_nts.dll",run
    3⤵
    - Blocklisted process makes network request
    - Loads dropped DLL
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2264

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\AMMYY\aa_nts.dll

Filesize
902KB

MD5
480a66902e6e7cdafaa6711e8697ff8c

SHA1
6ac730962e7c1dba9e2ecc5733a506544f3c8d11

SHA256
7eaaaa6010bbcd6bb8c9ad08d4b0966c7aedc9b2ac24758f170012ac36e508b5

SHA512
7d010cd47b7d1adf66f9c97afc6c3805997aa5c7cc6ff13eddee81f24cf2b95a3fe375ec5b3d6185c0bc8840b4ad91ae143c73a39af26391cc182ab6a1793ba5

Download Submit
C:\ProgramData\AMMYY\aa_nts.log

Filesize
4KB

MD5
2afb5ab216b55c2be74bffee33a9454d

SHA1
8603f5bcaffa01d78d2fde0d6b0d9e4acb0bd1a6

SHA256
245dc57203604b596580faeb3050fe7799fccec8aee7020e9e2364d1783b11b9

SHA512
21328e33f131c58de13a1312fabe343234ea3f0156e6995b7232043dc8a3fd6bd7eb4f6e29f3213f76fced61ab3a3ccc47449771b12a3fb9c702a3c00c9ecfa9

Download Submit
C:\ProgramData\AMMYY\aa_nts.msg

Filesize
46B

MD5
3f05819f995b4dafa1b5d55ce8d1f411

SHA1
404449b79a16bfc4f64f2fd55cd73d5d27a85d71

SHA256
7e0bf0cbd06a087500a9c3b50254df3a8a2c2980921ab6a62ab1121941c80fc0

SHA512
34abb7df8b3a68e1649ff0d2762576a4d4e65da548e74b1aa65c2b82c1b89f90d053ecddac67c614ca6084dc5b2cb552949250fb70f49b536f1bcb0057717026

Download Submit
C:\ProgramData\AMMYY\settings3.bin

Filesize
327B

MD5
0d137b31eea735cfa48cfbac8011e647

SHA1
fd6ef68874fc25e5f76fcdb9afd5147c6d3cf19f

SHA256
fa16ecae205c55cbb5f3039b1a64f689fd0596d93d9836c0915ff6e10aa1afac

SHA512
0d75027e6cf10ed758c9b8c989b8756d00099164eeb7bf39deec9c15947d03dabea5c58bdaef37f0daa31daeebbf92dced04d2066044c52b587f2f301a45d3a4

Download Submit
memory/2264-19-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/2264-44-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/2264-61-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/2264-76-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/2264-91-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/2264-107-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/2264-120-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/2264-136-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download