buer | f23db00ee052d07bf66ce6aa644ead488e182dfb21c4c5c42bb9677db839a310

Analysis

max time kernel
1800s
max time network
1806s
platform
windows7_x64
resource
win7
submitted
16-07-2020 20:13

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General

Target

214053f.exe
Size

38KB
MD5

1f4ce9581d372c6297794233cbeca1ea
SHA1

c9661c46db129433e350d1ca3fd0ebd79b190f88
SHA256

f23db00ee052d07bf66ce6aa644ead488e182dfb21c4c5c42bb9677db839a310
SHA512

571c4a811586bf26b3de8cbcc59be0b27f4fb58826844e8ef73dcf8c61af8c918dd8c06f42339867b4877f00ab11e8ec8d1901afbde57e967748ccd23425447f

Score

10^/10

buer cobaltstrike metasploit backdoor loader persistence trojan

Malware Config

Extracted

Family

buer

https://162.244.81.87/

http://162.244.81.87:8080/

Extracted

Family

metasploit

Version

windows/download_exec

http://31.14.40.55:80/YRDm

Attributes

headers User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; qdesk 2.4.1263.203; Windows NT 6.1; WOW64; Trident/5.0)

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer
Cobaltstrike
Detected malicious payload which is part of Cobaltstrike.
trojan backdoor cobaltstrike
MetaSploit
Detected malicious payload which is part of the Metasploit Framework, likely generated with msfvenom or similar.
trojan backdoor metasploit

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\e5ba68ea51572fa02d86\\gennt.exe\""	gennt.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\e5ba68ea51572fa02d86\\gennt.exe\""	secinit.exe

Buer Loader 5 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/files/0x00040000000131a6-0.dat	buer
behavioral1/files/0x00040000000131a6-1.dat	buer
behavioral1/files/0x00040000000131a6-3.dat	buer
behavioral1/files/0x00040000000131a6-4.dat	buer
behavioral1/memory/1764-5-0x0000000000000000-mapping.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
1792	gennt.exe

Deletes itself 1 IoCs

pid	Process
1792	gennt.exe

Loads dropped DLL 3 IoCs

pid	Process
608	214053f.exe
608	214053f.exe
1988	regsvr32.exe

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\Z:	secinit.exe
File opened (read-only)	\??\H:	secinit.exe
File opened (read-only)	\??\N:	secinit.exe
File opened (read-only)	\??\O:	secinit.exe
File opened (read-only)	\??\U:	secinit.exe
File opened (read-only)	\??\W:	secinit.exe
File opened (read-only)	\??\J:	secinit.exe
File opened (read-only)	\??\K:	secinit.exe
File opened (read-only)	\??\S:	secinit.exe
File opened (read-only)	\??\T:	secinit.exe
File opened (read-only)	\??\M:	secinit.exe
File opened (read-only)	\??\P:	secinit.exe
File opened (read-only)	\??\R:	secinit.exe
File opened (read-only)	\??\E:	secinit.exe
File opened (read-only)	\??\F:	secinit.exe
File opened (read-only)	\??\G:	secinit.exe
File opened (read-only)	\??\I:	secinit.exe
File opened (read-only)	\??\L:	secinit.exe
File opened (read-only)	\??\Y:	secinit.exe
File opened (read-only)	\??\A:	secinit.exe
File opened (read-only)	\??\B:	secinit.exe
File opened (read-only)	\??\Q:	secinit.exe
File opened (read-only)	\??\V:	secinit.exe
File opened (read-only)	\??\X:	secinit.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1988 set thread context of 916	1988	regsvr32.exe	46

Runs net.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
1764	secinit.exe
1764	secinit.exe
1460	rundll32.exe
1948	rundll32.exe
1948	rundll32.exe
1948	rundll32.exe
1948	rundll32.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1460	rundll32.exe
Token: SeDebugPrivilege	1948	rundll32.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 608 wrote to memory of 1792	608	214053f.exe	26
PID 608 wrote to memory of 1792	608	214053f.exe	26
PID 608 wrote to memory of 1792	608	214053f.exe	26
PID 608 wrote to memory of 1792	608	214053f.exe	26
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1792 wrote to memory of 1764	1792	gennt.exe	27
PID 1764 wrote to memory of 1128	1764	secinit.exe	28
PID 1764 wrote to memory of 1128	1764	secinit.exe	28
PID 1764 wrote to memory of 1128	1764	secinit.exe	28
PID 1764 wrote to memory of 1128	1764	secinit.exe	28
PID 1764 wrote to memory of 1988	1764	secinit.exe	32
PID 1764 wrote to memory of 1988	1764	secinit.exe	32
PID 1764 wrote to memory of 1988	1764	secinit.exe	32
PID 1764 wrote to memory of 1988	1764	secinit.exe	32
PID 1764 wrote to memory of 1988	1764	secinit.exe	32
PID 1764 wrote to memory of 1988	1764	secinit.exe	32
PID 1764 wrote to memory of 1988	1764	secinit.exe	32
PID 1988 wrote to memory of 1460	1988	regsvr32.exe	35
PID 1988 wrote to memory of 1460	1988	regsvr32.exe	35
PID 1988 wrote to memory of 1460	1988	regsvr32.exe	35
PID 1988 wrote to memory of 1460	1988	regsvr32.exe	35
PID 1988 wrote to memory of 1460	1988	regsvr32.exe	35
PID 1460 wrote to memory of 476	1460	rundll32.exe	7
PID 1460 wrote to memory of 476	1460	rundll32.exe	7
PID 1988 wrote to memory of 1948	1988	regsvr32.exe	36
PID 1988 wrote to memory of 1948	1988	regsvr32.exe	36
PID 1988 wrote to memory of 1948	1988	regsvr32.exe	36
PID 1988 wrote to memory of 1948	1988	regsvr32.exe	36
PID 1988 wrote to memory of 1948	1988	regsvr32.exe	36
PID 1988 wrote to memory of 1856	1988	regsvr32.exe	37
PID 1988 wrote to memory of 1856	1988	regsvr32.exe	37
PID 1988 wrote to memory of 1856	1988	regsvr32.exe	37
PID 1988 wrote to memory of 1856	1988	regsvr32.exe	37
PID 1988 wrote to memory of 1856	1988	regsvr32.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 476 wrote to memory of 1856	476	lsass.exe	37
PID 1988 wrote to memory of 1576	1988	regsvr32.exe	38
PID 1988 wrote to memory of 1576	1988	regsvr32.exe	38
PID 1988 wrote to memory of 1576	1988	regsvr32.exe	38
PID 1988 wrote to memory of 1576	1988	regsvr32.exe	38
PID 1576 wrote to memory of 1076	1576	cmd.exe	40
PID 1576 wrote to memory of 1076	1576	cmd.exe	40
PID 1576 wrote to memory of 1076	1576	cmd.exe	40
PID 1576 wrote to memory of 1076	1576	cmd.exe	40
PID 1076 wrote to memory of 1968	1076	net.exe	41
PID 1076 wrote to memory of 1968	1076	net.exe	41
PID 1076 wrote to memory of 1968	1076	net.exe	41

C:\Windows\system32\lsass.exe
C:\Windows\system32\lsass.exe
1⤵
- Suspicious use of WriteProcessMemory
PID:476

C:\Users\Admin\AppData\Local\Temp\214053f.exe
"C:\Users\Admin\AppData\Local\Temp\214053f.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:608
- C:\ProgramData\e5ba68ea51572fa02d86\gennt.exe
  C:\ProgramData\e5ba68ea51572fa02d86\gennt.exe "C:\Users\Admin\AppData\Local\Temp\214053f.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1792
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\e5ba68ea51572fa02d86\gennt.exe
    3⤵
    - Modifies WinLogon for persistence
    - Enumerates connected drives
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:1764
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\e5ba68ea51572fa02d86}"
      4⤵
      PID:1128
  - - C:\Windows\SysWOW64\regsvr32.exe
      "C:\Windows\System32\regsvr32.exe" "C:\ProgramData\e5ba68ea51572fa02d86\dupihaiqan.dll"
      4⤵
      Loads dropped DLL
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:1988
    - - C:\Windows\system32\rundll32.exe
        
        C:\Windows\sysnative\rundll32.exe
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:1460
    - - C:\Windows\system32\rundll32.exe
        
        C:\Windows\sysnative\rundll32.exe
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1948
    - - C:\Windows\system32\rundll32.exe
        
        C:\Windows\sysnative\rundll32.exe
        5⤵
        
        PID:1856
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /C net group "enterprise admins" /domain
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1576
      - C:\Windows\SysWOW64\net.exe
        
        net group "enterprise admins" /domain
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:1076
        
        C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 group "enterprise admins" /domain
        7⤵
        
        PID:1968
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /C net group "domain admins" /domain
        5⤵
        
        PID:1716
      - C:\Windows\SysWOW64\net.exe
        
        net group "domain admins" /domain
        6⤵
        
        PID:1916
        
        C:\Windows\SysWOW64\net1.exe
        
        C:\Windows\system32\net1 group "domain admins" /domain
        7⤵
        
        PID:2008
    - - C:\Windows\syswow64\rundll32.exe
        
        C:\Windows\syswow64\rundll32.exe
        5⤵
        
        PID:916

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/916-25-0x0000000000090000-0x00000000000A3000-memory.dmp

Filesize
76KB

Download
memory/1856-16-0x00000000002DFFF0-0x00000000002E2BF0-disk.dmp

Filesize
11KB

Download
memory/1988-10-0x0000000000220000-0x0000000000229000-memory.dmp

Filesize
36KB

Download
memory/1988-12-0x0000000000890000-0x0000000000891000-memory.dmp

Filesize
4KB

Download
memory/1988-11-0x000000006BAC0000-0x000000006BACB000-memory.dmp

Filesize
44KB

Download