flawedammyy | ee573647477339784dcef81024de1be1762833a20e5cc2b89a93e47d05b86b6a

General

Target

tmp.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
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

Processes:

tmp.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Control Panel\International\Geo\Nation tmp.exe
Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

4856 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

Processes:

tmp.exetmp.exe

description ioc process

File opened for modification \??\PhysicalDrive0 tmp.exe
File opened for modification \??\PhysicalDrive0 tmp.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Control Panel\International\Geo\Nation	tmp.exe

pid	process
4856	rundll32.exe

description	ioc	process
File opened for modification	\??\PhysicalDrive0	tmp.exe
File opened for modification	\??\PhysicalDrive0	tmp.exe

Drops file in System32 directory 12 IoCs

Processes:

tmp.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\5037AC1E573F140500110A0B67548B5E	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\IE	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCookies	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\History\History.IE5	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\103621DE9CD5414CC2538780B4B75751	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\103621DE9CD5414CC2538780B4B75751	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\5037AC1E573F140500110A0B67548B5E	tmp.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache\Content.IE5	tmp.exe

Modifies data under HKEY_USERS 14 IoCs

Processes:

tmp.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin	tmp.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProxyBypass = "1"	tmp.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	tmp.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE	tmp.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\History\CachePrefix = "Visited:"	tmp.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Content\CachePrefix	tmp.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	tmp.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\AutoDetect = "0"	tmp.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Cookies\CachePrefix = "Cookie:"	tmp.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\IntranetName = "1"	tmp.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Ammyy	tmp.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Ammyy\Admin\hr3 = 44e2c9ae87f0893cc13df5c0507b0d97672eb45c4244525b70b6118cd4d49645a00720a2c73f2a8b2e63cafa27233878ea391e0ae1fb8eb6ed1a8fb61bab46586dc6dba4	tmp.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	tmp.exe
Key created	\REGISTRY\USER\.DEFAULT\SOFTWARE\Ammyy\Admin	tmp.exe

Suspicious behavior: SetClipboardViewer 1 IoCs

Processes:

tmp.exe

pid process

2812 tmp.exe
Suspicious use of FindShellTrayWindow 5 IoCs

Processes:

tmp.exe

pid process

2812 tmp.exe
2812 tmp.exe
2812 tmp.exe
2812 tmp.exe
2812 tmp.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

tmp.exe

pid process

2812 tmp.exe

pid	process
2812	tmp.exe

pid	process
2812	tmp.exe
2812	tmp.exe
2812	tmp.exe
2812	tmp.exe
2812	tmp.exe

pid	process
2812	tmp.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

tmp.exetmp.exe

description	pid	process	target process
PID 2760 wrote to memory of 2812	2760	tmp.exe	tmp.exe
PID 2760 wrote to memory of 2812	2760	tmp.exe	tmp.exe
PID 2760 wrote to memory of 2812	2760	tmp.exe	tmp.exe
PID 2812 wrote to memory of 4856	2812	tmp.exe	rundll32.exe
PID 2812 wrote to memory of 4856	2812	tmp.exe	rundll32.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Writes to the Master Boot Record (MBR)
PID:4824

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe" -service -lunch
1⤵
- Suspicious use of WriteProcessMemory
PID:2760

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
2⤵
- Checks computer location settings
- Writes to the Master Boot Record (MBR)
- Drops file in System32 directory
- Modifies data under HKEY_USERS
- Suspicious behavior: SetClipboardViewer
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2812

C:\Windows\SYSTEM32\rundll32.exe
rundll32.exe "C:\ProgramData\AMMYY\aa_nts.dll",run
3⤵
- Loads dropped DLL
PID:4856

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

Query Registry

1

T1012

System Information Discovery

1

T1082

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.dll

Filesize
902KB

MD5
480a66902e6e7cdafaa6711e8697ff8c

SHA1
6ac730962e7c1dba9e2ecc5733a506544f3c8d11

SHA256
7eaaaa6010bbcd6bb8c9ad08d4b0966c7aedc9b2ac24758f170012ac36e508b5

SHA512
7d010cd47b7d1adf66f9c97afc6c3805997aa5c7cc6ff13eddee81f24cf2b95a3fe375ec5b3d6185c0bc8840b4ad91ae143c73a39af26391cc182ab6a1793ba5

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
530db80e26eb8e96b32ae314003df5d7

SHA1
4f0cabc834e652a165d22446a518243e84bd2448

SHA256
19a98d1d4497478c4731e6548b7016671b66cc5b34924d74bff3247f4641cd2c

SHA512
da5c11727a4664f50932decb12d9dad2779b5f4b7c235c138fb3fa0dc73f532b4e8eed4aa71776385bd4ca405b4ab3cd3e499158f3c192034d8999e61420aed3

Download Submit
memory/4856-17-0x0000000064200000-0x00000000642EE000-memory.dmp

Filesize
952KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads