nloader | 67c35a01ebe2933d5772677793719c2702ef18274e84fc188f5eb6eee4f32752

General

Target

_____.xlsb
Size

225KB
MD5

0abe41c27fa3f1e62b74ff4903887d86
SHA1

3707fed2be2ec70152bdc5cd691137a7d6b62013
SHA256

67c35a01ebe2933d5772677793719c2702ef18274e84fc188f5eb6eee4f32752
SHA512

0b6bc4a8f420c9cb463fa10ec1cfe64cf90ee132ee2f46ec739c381e0d2a21d848896cf1d89b88de9fb6d7b88c2ebc1c497ee8cba08205802c372da5e707f7a9

Score

10^/10

nloader loader

Malware Config

Signatures

Nloader
Simple loader that includes the keyword 'cambo' in the URL used to download other families.
loader nloader

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

cmd.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	792	3108	cmd.exe	EXCEL.EXE

Nloader Payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4000-186-0x0000000000E30000-0x0000000000E36000-memory.dmp	nloader

Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

4000 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1056 4000 WerFault.exe rundll32.exe

pid	process
4000	rundll32.exe

pid	pid_target	process	target process
1056	4000	WerFault.exe	rundll32.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

3108 EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 16 IoCs

Processes:

WerFault.exe

pid	process
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe
1056	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

WerFault.exe

description pid process

Token: SeRestorePrivilege 1056 WerFault.exe
Token: SeBackupPrivilege 1056 WerFault.exe
Token: SeDebugPrivilege 1056 WerFault.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

EXCEL.EXE

pid process

3108 EXCEL.EXE
3108 EXCEL.EXE

description	pid	process
Token: SeRestorePrivilege	1056	WerFault.exe
Token: SeBackupPrivilege	1056	WerFault.exe
Token: SeDebugPrivilege	1056	WerFault.exe

Suspicious use of SetWindowsHookEx 22 IoCs

Processes:

EXCEL.EXE

pid	process
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE
3108	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

EXCEL.EXEcmd.exerundll32.exe

description	pid	process	target process
PID 3108 wrote to memory of 792	3108	EXCEL.EXE	cmd.exe
PID 3108 wrote to memory of 792	3108	EXCEL.EXE	cmd.exe
PID 792 wrote to memory of 2216	792	cmd.exe	certutil.exe
PID 792 wrote to memory of 2216	792	cmd.exe	certutil.exe
PID 792 wrote to memory of 2848	792	cmd.exe	rundll32.exe
PID 792 wrote to memory of 2848	792	cmd.exe	rundll32.exe
PID 2848 wrote to memory of 4000	2848	rundll32.exe	rundll32.exe
PID 2848 wrote to memory of 4000	2848	rundll32.exe	rundll32.exe
PID 2848 wrote to memory of 4000	2848	rundll32.exe	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\_____.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3108

C:\Windows\SYSTEM32\cmd.exe
cmd.exe /c certutil -decode %PUBLIC%\14118.doy %PUBLIC%\14118.biy && rundll32 %PUBLIC%\14118.biy,DF1
2⤵
- Process spawned unexpected child process
- Suspicious use of WriteProcessMemory
PID:792

C:\Windows\system32\certutil.exe
certutil -decode C:\Users\Public\14118.doy C:\Users\Public\14118.biy
3⤵
PID:2216

C:\Windows\system32\rundll32.exe
rundll32 C:\Users\Public\14118.biy,DF1
3⤵
- Suspicious use of WriteProcessMemory
PID:2848

C:\Windows\SysWOW64\rundll32.exe
rundll32 C:\Users\Public\14118.biy,DF1
4⤵
- Loads dropped DLL
PID:4000

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4000 -s 884
5⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1056

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Public\14118.biy

MD5
d54955f8150d1ae905a9fbcaac97a71b

SHA1
b4027b0c59c4a7f2d0b2c5bd8409976b9bade4ed

SHA256
627f67c18ccda5a5e3e3b90738545c0553abee1cee81e03b447ba33d46674a58

SHA512
095609a5d0f08c9b5dc48e0f1501e69ec512806592da3add7d07a5b4d7abd745efa9e41f62ec3e43b4add34a01ccaf60722a8f5ecd945417fc47afcbc7294bcd

Download Submit
C:\Users\Public\14118.doy

MD5
d18a8f1eef6962d92e2eb47c2ef0e0d4

SHA1
18fc95b23c3a44e9e0d86516fc68c3a02e3a0a36

SHA256
559d08c26df410ad35dc227b4e55e6aeffbe549a5b8ff71d050e93dbfcce1495

SHA512
5716ffffe6d74373436a6f7d8a6b6ee80a85bda5b9ee813577955902f9bb3d31913c7d62005ea81f7a2ebdb6a8fdb1232bc83ffb709574688ac7ecd1505e2c78

Download Submit
\Users\Public\14118.biy

MD5
d54955f8150d1ae905a9fbcaac97a71b

SHA1
b4027b0c59c4a7f2d0b2c5bd8409976b9bade4ed

SHA256
627f67c18ccda5a5e3e3b90738545c0553abee1cee81e03b447ba33d46674a58

SHA512
095609a5d0f08c9b5dc48e0f1501e69ec512806592da3add7d07a5b4d7abd745efa9e41f62ec3e43b4add34a01ccaf60722a8f5ecd945417fc47afcbc7294bcd

Download Submit
memory/792-179-0x0000000000000000-mapping.dmp

Download
memory/2216-180-0x0000000000000000-mapping.dmp

Download
memory/2848-182-0x0000000000000000-mapping.dmp

Download
memory/3108-118-0x00007FFFABD70000-0x00007FFFABD80000-memory.dmp

Filesize
64KB

Download
memory/3108-121-0x00007FFFABD70000-0x00007FFFABD80000-memory.dmp

Filesize
64KB

Download
memory/3108-122-0x00007FFFCC410000-0x00007FFFCD4FE000-memory.dmp

Filesize
16.9MB

Download
memory/3108-123-0x00007FFFCA2F0000-0x00007FFFCC1E5000-memory.dmp

Filesize
31.0MB

Download
memory/3108-114-0x00007FF7CF830000-0x00007FF7D2DE6000-memory.dmp

Filesize
53.7MB

Download
memory/3108-117-0x00007FFFABD70000-0x00007FFFABD80000-memory.dmp

Filesize
64KB

Download
memory/3108-116-0x00007FFFABD70000-0x00007FFFABD80000-memory.dmp

Filesize
64KB

Download
memory/3108-115-0x00007FFFABD70000-0x00007FFFABD80000-memory.dmp

Filesize
64KB

Download
memory/4000-184-0x0000000000000000-mapping.dmp

Download
memory/4000-186-0x0000000000E30000-0x0000000000E36000-memory.dmp

Filesize
24KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads