buer | 0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be

General

Target

0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe
Size

128KB
MD5

f35cd516f71e2cc4ade549a6487624ca
SHA1

64800a2f85e12090eea5109e05d969a08ae9850a
SHA256

0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be
SHA512

866a549f65cc25c73b0087cf1fd769446f1d82aa38b24e211f6e517b481c02ee3d607055aaeab6be199a42e50f917920675f4c5079e7cf83606154165bdbb3fb

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

https://mesoplano.com/

https://banusle.top/

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

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\2e2a8700feea10f3562d\\gennt.exe\""	gennt.exe

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1524-61-0x0000000000290000-0x000000000029C000-memory.dmp	buer
behavioral1/memory/1460-63-0x0000000000280000-0x000000000028C000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
1460	gennt.exe

Deletes itself 1 IoCs

pid	Process
1460	gennt.exe

Loads dropped DLL 2 IoCs

pid	Process
1524	0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe
1524	0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.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)	\??\T:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\F:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1460	gennt.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1524 wrote to memory of 1460	1524	0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe	29
PID 1524 wrote to memory of 1460	1524	0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe	29
PID 1524 wrote to memory of 1460	1524	0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe	29
PID 1524 wrote to memory of 1460	1524	0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe	29
PID 1460 wrote to memory of 288	1460	gennt.exe	30
PID 1460 wrote to memory of 288	1460	gennt.exe	30
PID 1460 wrote to memory of 288	1460	gennt.exe	30
PID 1460 wrote to memory of 288	1460	gennt.exe	30
PID 1460 wrote to memory of 432	1460	gennt.exe	31
PID 1460 wrote to memory of 432	1460	gennt.exe	31
PID 1460 wrote to memory of 432	1460	gennt.exe	31
PID 1460 wrote to memory of 432	1460	gennt.exe	31

C:\Users\Admin\AppData\Local\Temp\0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe
"C:\Users\Admin\AppData\Local\Temp\0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1524
- C:\ProgramData\2e2a8700feea10f3562d\gennt.exe
  C:\ProgramData\2e2a8700feea10f3562d\gennt.exe "C:\Users\Admin\AppData\Local\Temp\0c09ea2d5722a2484804bf8c4f051d66d8a95d23c19e5d1277a55cafd80b67be.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Deletes itself
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1460
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\2e2a8700feea10f3562d\gennt.exe
    3⤵
    PID:288
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\2e2a8700feea10f3562d}"
    3⤵
    PID:432

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1460-62-0x00000000001D0000-0x00000000001D1000-memory.dmp

Filesize
4KB

Download
memory/1460-63-0x0000000000280000-0x000000000028C000-memory.dmp

Filesize
48KB

Download
memory/1524-55-0x0000000075AB1000-0x0000000075AB3000-memory.dmp

Filesize
8KB

Download
memory/1524-60-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1524-61-0x0000000000290000-0x000000000029C000-memory.dmp

Filesize
48KB

Download

Analysis

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