flawedammyy | 980e3d4eb5581e7a4567e2fc6a7e1a99e4e78598e662c98e1d45fa29b26e1426

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

flow	pid	Process
65	3260	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-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation	AA_v3.exe

Loads dropped DLL 1 IoCs

pid	Process
3260	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

T1067

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	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\Content\3805946C7C58953EFFCBA8631AC290B5	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\Content	AA_v3.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\3805946C7C58953EFFCBA8631AC290B5	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\Ammyy	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
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	AA_v3.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	AA_v3.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = 8a1a42294be8e0f5e41b0207754b3c1faf0690679889308d4c701c55a962fe830efe878a2e9281a94ef17ee9d1d634080ff99dcf03f8d36e5128f41c2c3777aa3c86f15f	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\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 46 IoCs

pid	Process
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe
3260	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeLockMemoryPrivilege	3260	rundll32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3204	AA_v3.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3204	AA_v3.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 3060 wrote to memory of 3204	3060	AA_v3.exe	85
PID 3060 wrote to memory of 3204	3060	AA_v3.exe	85
PID 3060 wrote to memory of 3204	3060	AA_v3.exe	85
PID 3204 wrote to memory of 3260	3204	AA_v3.exe	91
PID 3204 wrote to memory of 3260	3204	AA_v3.exe	91

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:3336

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:3060
- 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:3204
- - 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:3260

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Bootkit

1

T1067

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

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.dll

Filesize
902KB

MD5
480a66902e6e7cdafaa6711e8697ff8c

SHA1
6ac730962e7c1dba9e2ecc5733a506544f3c8d11

SHA256
7eaaaa6010bbcd6bb8c9ad08d4b0966c7aedc9b2ac24758f170012ac36e508b5

SHA512
7d010cd47b7d1adf66f9c97afc6c3805997aa5c7cc6ff13eddee81f24cf2b95a3fe375ec5b3d6185c0bc8840b4ad91ae143c73a39af26391cc182ab6a1793ba5

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

Filesize
4KB

MD5
5564daf0d656dbf4330f3acd6110c9a3

SHA1
5f48aff026bcec71b635884e7d60dd329b6722b1

SHA256
fd333420b028fbc1d1e972b4494320097a27538af041c0ffeb1c87557a6a31a2

SHA512
0ab43ca0da98e10c1ac83c0c8c9744b7bede9bfcc65be9d449e71ae788c89a642bf30742cc8e7d2f127feb0a062c12abeaa9c00a8b9846abbb4bfc49aa046b7f

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
4c462159d7bef2d9a4096f146d551b58

SHA1
9b9b092e0b3bcc7b50da2bac7bc9695036e09801

SHA256
f49e6805556377193a6f7e6a152ef67221f1f6db3bc7fa526aaf1428e3840ff3

SHA512
d9b71c1e6f95cac12cc0fca36d4d074c9f02b597ea88d6d7a370dcee4f6d6ceac5e713390eda2835fdba4de8413e0d55750863a3722bf0ed798e6ac4a59f0fc8

Download Submit
memory/3260-183-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/3260-169-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/3260-150-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/3260-199-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/3260-214-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/3260-226-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/3260-242-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download
memory/3260-257-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download

Analysis

Sharing