flawedammyy | ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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
56	4088	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
4088	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	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\Content\34B6AF881B9D738561FC099B83DF3A01	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\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\Local\Microsoft\Windows\INetCache\IE	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData	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
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = 42a6106b4277f486e110a4d515399cc6a0039b679889308d4c701c55a962fe830efe878a75482ecba565b8f8fbd447d95497b17be428ef278df841c8e89236453a02df47d05cd443cd2540	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\AutoDetect = "0"	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Ammyy\Admin	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin	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
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	AA_v3.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe
4088	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeLockMemoryPrivilege	4088	rundll32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3096	AA_v3.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3096	AA_v3.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3900 wrote to memory of 3096	3900	AA_v3.exe	84
PID 3900 wrote to memory of 3096	3900	AA_v3.exe	84
PID 3900 wrote to memory of 3096	3900	AA_v3.exe	84
PID 3096 wrote to memory of 4088	3096	AA_v3.exe	105
PID 3096 wrote to memory of 4088	3096	AA_v3.exe	105

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:3540

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:3900
- 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:3096
- - 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:4088

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

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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
343476ed9b4692a69f3704cfc42c48b2

SHA1
cb707bfda4016fa715a9797297ba60ed5f9a5fd4

SHA256
5bb27666072cf5f60e474d2ae67be04a17b2b71ea78627fbea72fdfe31747057

SHA512
7e61cc987cab3860f10571c22f082372a71a7345ffb3504b3437e7fa895bafe65818228601598835635556d76ede2435e471b177e6d224db7ea0b04f593cef57

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
138cf34c9aadb5c899fab396f04c933d

SHA1
303740048b0f85278d05981ebd103f9dc68e02ac

SHA256
baa30bc225d8369c3db974901f05ac0b2e44ed71fa66247a63a10939c06147ff

SHA512
ecb93b6872d812d47e20bc397aa99f55cc649a62be2c76d93e018c761b1a9b1badeaed4eeac9d154a700cf70e3c8acaa54ab05404e20b80c6920065883213bb7

Download Submit
memory/4088-17-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4088-31-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4088-39-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4088-47-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4088-60-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4088-80-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4088-97-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/4088-114-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download