flawedammyy | ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a

Analysis

max time kernel
150s
max time network
156s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
10-11-2024 16:13

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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 discovery persistence trojan

Malware Config

Signatures

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

Blocklisted process makes network request 1 IoCs

flow	pid	Process
12	5072	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
5072	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

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

description	ioc	Process
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\LocalLow\Microsoft\CryptnetUrlCache\Content\34B6AF881B9D738561FC099B83DF3A01	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\Local\Microsoft\Windows\INetCache\IE	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCookies	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\Content\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	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\103621DE9CD5414CC2538780B4B75751	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\34B6AF881B9D738561FC099B83DF3A01	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

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AA_v3.exe

Modifies data under HKEY_USERS 11 IoCs

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\Ammyy\Admin	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\IntranetName = "1"	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	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	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	AA_v3.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = e650b85a8dd84dcc55d6e3309b9724d01889fdb733501e95d8d24567bb5e21d622a941182f35a85084b244e0935c9a7b170f2c53247900bd3419c095446217407766ec0e4ca1235efd5307	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	AA_v3.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe
5072	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeLockMemoryPrivilege	5072	rundll32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4292	AA_v3.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4292	AA_v3.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4736 wrote to memory of 4292	4736	AA_v3.exe	80
PID 4736 wrote to memory of 4292	4736	AA_v3.exe	80
PID 4736 wrote to memory of 4292	4736	AA_v3.exe	80
PID 4292 wrote to memory of 5072	4292	AA_v3.exe	82
PID 4292 wrote to memory of 5072	4292	AA_v3.exe	82

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)
- System Location Discovery: System Language Discovery
PID:3480

C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
"C:\Users\Admin\AppData\Local\Temp\AA_v3.exe" -service -lunch
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4736
- C:\Users\Admin\AppData\Local\Temp\AA_v3.exe
  "C:\Users\Admin\AppData\Local\Temp\AA_v3.exe"
  2⤵
  - Writes to the Master Boot Record (MBR)
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies data under HKEY_USERS
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4292
- - 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:5072

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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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
10ffe64aa810e31e62420f14660c5e1b

SHA1
b59056db7845017fb618cdf553a6ecc43a2010f4

SHA256
1ec8173aa68ac54556a82d3f8b0a233519a7a2279f15ea0c6bf5120f172fd837

SHA512
9f4e1baa4d6034bfc3f92110a9cf681635fa221de111594e1c7c93ef98b52266f76d079bd8c3ec46b28d65ee11ba10a4a361d83185d191c9e9865ab0c4941b09

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

Filesize
46B

MD5
76038623e270f399769df67a3ed15c16

SHA1
ebf7d7537f45738be48e6f64d59c846b13fb4334

SHA256
4dbdf4f709d50f9521e92ce5f7d4f305e2384bcda387fb2b325ff17d205bb687

SHA512
a5316694d844e5b10c589f58fdf65645568b3909b2914f85c99195f9625e4124f787bc0980cff98f1e8289ff84824620a03f32cdab18e5bbcb2e59b33f397aec

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

Filesize
334B

MD5
c986025ace6057a11f8e5cce2f1290c7

SHA1
d61ba9f709689c7f523f126d1881c69897bed502

SHA256
74eecc9a3fc93a3e17a72fd23e741ab06c07e5fc5c3cd2283008e7cb08d7b7f3

SHA512
708dd14c5144aa8ca10c93e765204615c12d1a4a37f70eee137bfea8786093b2dd24d8d4f8fea30be12038d9b37415898753dc40e4321b20a0362f883ae58433

Download Submit
memory/5072-19-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/5072-34-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/5072-42-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/5072-50-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/5072-65-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/5072-82-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/5072-99-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/5072-117-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download