flawedammyy | ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a

Analysis

max time kernel
150s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
16-10-2024 22:59

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 discovery 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

flow	pid	Process
62	4400	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	AA_v3.exe

Loads dropped DLL 1 IoCs

pid	Process
4400	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 11 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\A82946818BB0433A7DC1AFD2189B16AF	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\LocalLow\Microsoft\CryptnetUrlCache\Content\103621DE9CD5414CC2538780B4B75751	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\A82946818BB0433A7DC1AFD2189B16AF	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\MetaData	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	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\Ammyy\Admin	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	AA_v3.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin	AA_v3.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = 0e20479b574d4387d6b10be39c309db7e9c4bda57eaf154a5d5da214d2128e843cbf07ec51144691b60741dc5be5352f3c354e1f65e5a7ddc34ff04ea60247d20201545eaa72aed9e6ceb9	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\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\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	AA_v3.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe
4400	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeLockMemoryPrivilege	4400	rundll32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5044	AA_v3.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5044	AA_v3.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2416 wrote to memory of 5044	2416	AA_v3.exe	85
PID 2416 wrote to memory of 5044	2416	AA_v3.exe	85
PID 2416 wrote to memory of 5044	2416	AA_v3.exe	85
PID 5044 wrote to memory of 4400	5044	AA_v3.exe	95
PID 5044 wrote to memory of 4400	5044	AA_v3.exe	95

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:964

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:2416
- 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
  - System Location Discovery: System Language Discovery
  - Modifies data under HKEY_USERS
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:5044
- - 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:4400

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

System Location Discovery

T1614

System Language Discovery

T1614.001

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
bc8c0a28430600d890b4a2ddde1c9230

SHA1
8576cf690808df2619edb40071eaa2dcd7a45320

SHA256
02aac19a9f27ac2dabef0f6698f6a81b8001d7143b86957ba0581ff6d582d279

SHA512
c80885f18626000001109340deb96cb647e8fc9f9674e2090f96a63b0c981e448bcbf8136ca6839d5b853187096895ee821b983510aef5a6a64ed790bf1157f4

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
6aec24af5032b2728bec153b6a5d76bb

SHA1
d569068bd756e2dbead56d477e1d985e32aacb28

SHA256
59e10f308c4dbf5db4d5d349f29f4ca9ce902a8193f37436d3056eaced04f94e

SHA512
f40c5f61043959d4893f25f4c74afdda59d380c64d5de60a1a8f457845c847c99311c3f40417b82b2096a078af6cbd17cba9da991218dd1e1a538f393b029c5b

Download Submit
memory/4400-17-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4400-39-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4400-53-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4400-65-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4400-79-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4400-95-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4400-111-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4400-126-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download