flawedammyy | ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a

General

Target

rh111.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

Loads dropped DLL 1 IoCs

pid	Process
8	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	rh111.exe
File opened for modification	\??\PhysicalDrive0	rh111.exe

Drops file in System32 directory 13 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCookies	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\103621DE9CD5414CC2538780B4B75751	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\A82946818BB0433A7DC1AFD2189B16AF	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\57C8EDB95DF3F0AD4EE2DC2B8CFD4157	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\103621DE9CD5414CC2538780B4B75751	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\A82946818BB0433A7DC1AFD2189B16AF	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5	rh111.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE	rh111.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	rh111.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rh111.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rh111.exe

Modifies data under HKEY_USERS 11 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Ammyy\Admin	rh111.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	rh111.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin	rh111.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = 8e60660579eedc8eeb0d50b0bed2ec073c125c4f96e40ee1588cc2a3b89a773a7f17fd33ba3137db1ded0119bcae439c1ebaedb81b73cbc783a3dbef226164332581ad8f07b81fcd21e0d1	rh111.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	rh111.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	rh111.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	rh111.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	rh111.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	rh111.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	rh111.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	rh111.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4664	rh111.exe
4664	rh111.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
4664	rh111.exe
4664	rh111.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 468 wrote to memory of 4664	468	rh111.exe	83
PID 468 wrote to memory of 4664	468	rh111.exe	83
PID 468 wrote to memory of 4664	468	rh111.exe	83
PID 4664 wrote to memory of 8	4664	rh111.exe	84
PID 4664 wrote to memory of 8	4664	rh111.exe	84

C:\Users\Admin\AppData\Local\Temp\rh111.exe
"C:\Users\Admin\AppData\Local\Temp\rh111.exe"
1⤵
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
PID:3204

C:\Users\Admin\AppData\Local\Temp\rh111.exe
"C:\Users\Admin\AppData\Local\Temp\rh111.exe" -service -lunch
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:468
- C:\Users\Admin\AppData\Local\Temp\rh111.exe
  "C:\Users\Admin\AppData\Local\Temp\rh111.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:4664
- - C:\Windows\SYSTEM32\rundll32.exe
    rundll32.exe "C:\ProgramData\AMMYY\aa_nts.dll",run
    3⤵
    - Loads dropped DLL
    PID:8

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

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.msg

Filesize
46B

MD5
76038623e270f399769df67a3ed15c16

SHA1
ebf7d7537f45738be48e6f64d59c846b13fb4334

SHA256
4dbdf4f709d50f9521e92ce5f7d4f305e2384bcda387fb2b325ff17d205bb687

SHA512
a5316694d844e5b10c589f58fdf65645568b3909b2914f85c99195f9625e4124f787bc0980cff98f1e8289ff84824620a03f32cdab18e5bbcb2e59b33f397aec

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

Filesize
334B

MD5
73f300a1043571094942afc17c77ccda

SHA1
3427fc48722a4988f507362d57bab34370601e73

SHA256
c3c97f5385931bf71ff6aa460b4a618acd60aa398922374fa94898951a66e6a7

SHA512
7d0d440866e6b9a5d4deabe9b62be1cad9b4cc43380483a1875c5d57da201efe47ce437fff369ed6903325d702c8a3ec7feca9b18f4b1aea7ba1a51ecbab2a46

Download Submit
memory/8-19-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads