buer | 4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

General

Target

4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066_JC.exe
Size

330KB
MD5

5be0349cfd478100b67fa4a867cfc516
SHA1

ad95587989a7bdeb80380a9e8b179f7e11db53a8
SHA256

4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066
SHA512

4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534
SSDEEP

1536:OphmidUnwrFnOATLZ+ZlDD44444444444444444444444444444444444444444t:sJUGpU1T83KvqAwsiYQmwf

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://161.35.192.121/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\19a1dd2df32c954d538b\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/4052-0-0x0000000000730000-0x000000000073F000-memory.dmp	buer
behavioral2/memory/4052-3-0x0000000000720000-0x000000000072D000-memory.dmp	buer
behavioral2/memory/4052-6-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral2/memory/3696-20-0x00000000023A0000-0x00000000023AF000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
3696	gennt.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4340	powershell.exe
4340	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4340	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4052 wrote to memory of 3696	4052	4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066_JC.exe	90
PID 4052 wrote to memory of 3696	4052	4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066_JC.exe	90
PID 4052 wrote to memory of 3696	4052	4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066_JC.exe	90
PID 3696 wrote to memory of 4340	3696	gennt.exe	91
PID 3696 wrote to memory of 4340	3696	gennt.exe	91
PID 3696 wrote to memory of 4340	3696	gennt.exe	91

C:\Users\Admin\AppData\Local\Temp\4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066_JC.exe
"C:\Users\Admin\AppData\Local\Temp\4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066_JC.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4052
- C:\ProgramData\19a1dd2df32c954d538b\gennt.exe
  C:\ProgramData\19a1dd2df32c954d538b\gennt.exe "C:\Users\Admin\AppData\Local\Temp\4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066_JC.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:3696
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\19a1dd2df32c954d538b}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4340

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\19a1dd2df32c954d538b\gennt.exe

Filesize
330KB

MD5
5be0349cfd478100b67fa4a867cfc516

SHA1
ad95587989a7bdeb80380a9e8b179f7e11db53a8

SHA256
4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

SHA512
4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534

Download Submit
C:\ProgramData\19a1dd2df32c954d538b\gennt.exe

Filesize
330KB

MD5
5be0349cfd478100b67fa4a867cfc516

SHA1
ad95587989a7bdeb80380a9e8b179f7e11db53a8

SHA256
4332bb07339c3096997fbb89b695afeb3b1e21632c8ecb4e144ec883d61ab066

SHA512
4a942340eaa75f5a98caf8073c2acc1c8c9310113d4d9e5b76cd4d91d87baa913c250caab657bc374f20233fc79d75dc6e29c74b4e301634934593dc86eb8534

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hftej3e1.cuo.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3696-20-0x00000000023A0000-0x00000000023AF000-memory.dmp

Filesize
60KB

Download
memory/3696-27-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/4052-9-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/4052-3-0x0000000000720000-0x000000000072D000-memory.dmp

Filesize
52KB

Download
memory/4052-18-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/4052-6-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/4052-0-0x0000000000730000-0x000000000073F000-memory.dmp

Filesize
60KB

Download
memory/4052-1-0x0000000000700000-0x0000000000701000-memory.dmp

Filesize
4KB

Download
memory/4340-31-0x0000000004E70000-0x0000000004E80000-memory.dmp

Filesize
64KB

Download
memory/4340-59-0x0000000006A00000-0x0000000006A1E000-memory.dmp

Filesize
120KB

Download
memory/4340-32-0x00000000054F0000-0x0000000005B18000-memory.dmp

Filesize
6.2MB

Download
memory/4340-46-0x0000000004E70000-0x0000000004E80000-memory.dmp

Filesize
64KB

Download
memory/4340-34-0x0000000005D50000-0x0000000005DB6000-memory.dmp

Filesize
408KB

Download
memory/4340-29-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Filesize
7.7MB

Download
memory/4340-45-0x0000000006440000-0x000000000645E000-memory.dmp

Filesize
120KB

Download
memory/4340-40-0x0000000005E30000-0x0000000005E96000-memory.dmp

Filesize
408KB

Download
memory/4340-33-0x0000000005460000-0x0000000005482000-memory.dmp

Filesize
136KB

Download
memory/4340-48-0x0000000006A20000-0x0000000006A52000-memory.dmp

Filesize
200KB

Download
memory/4340-49-0x0000000070410000-0x000000007045C000-memory.dmp

Filesize
304KB

Download
memory/4340-30-0x0000000004E80000-0x0000000004EB6000-memory.dmp

Filesize
216KB

Download
memory/4340-60-0x0000000007D90000-0x000000000840A000-memory.dmp

Filesize
6.5MB

Download
memory/4340-61-0x0000000007750000-0x000000000776A000-memory.dmp

Filesize
104KB

Download
memory/4340-62-0x0000000005160000-0x000000000516A000-memory.dmp

Filesize
40KB

Download
memory/4340-63-0x00000000079F0000-0x0000000007A86000-memory.dmp

Filesize
600KB

Download
memory/4340-64-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Filesize
7.7MB

Download
memory/4340-65-0x00000000079A0000-0x00000000079AE000-memory.dmp

Filesize
56KB

Download
memory/4340-66-0x0000000007AB0000-0x0000000007ACA000-memory.dmp

Filesize
104KB

Download
memory/4340-67-0x0000000007A90000-0x0000000007A98000-memory.dmp

Filesize
32KB

Download
memory/4340-70-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads