donutloader | abcb44b459e9f101106251bb9b4b7a07163554af450d0e61636417d12499cf2f

General

Target
所得税の確定申告に係る納税通知書3.exe
Size 250KB
Sample260916-j2k1javxew
SHA256 abcb44b459e9f101106251bb9b4b7a07163554af450d0e61636417d12499cf2f
MD5 aeb22262cc2114f611c92eb062b34da3
SHA1 0bacc5bfbfeac8bade04d085e995d8c7f31c5f7c
SHA512 46fe4d42aacdc0ad9a3da270238ea982bed1af30478e5cdddce7fea8e04d49d0eb6db1c6275bc4eae5677c4b0bd371864eb1191ff6d4af9dbf507771469c9215
SSDEEP 6144:fK3jQoHr3VF2mjkaRGP4PkhijsKgW3UMKYMKBbZixsN:fKEoJF2mjkabsKgW3/m8
TLSH
T13044A11237F810D5F1B69679AAB58512E7B2BC662B25C7CF1260016E9F73BD0AC34732
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery donutloader overlord loader persistence rat

Malware Config

Signatures

Family: DonutLoader
DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.
loader donutloader
Family: Overlord
Overlord is an open-source Windows RAT written in Golang.
rat overlord

Detects DonutLoader 1 IoCs

loader

resource	yara_rule
behavioral3/memory/4680-9-0x00000254A4AA0000-0x00000254A51C3000-memory.dmp	family_donutloader

Detects Overlord RAT 2 IoCs

resource	yara_rule
behavioral3/memory/4680-11-0x00000254A8880000-0x00000254ABBF7000-memory.dmp	family_overlord
behavioral3/memory/4764-19-0x000001C198080000-0x000001C19B3F7000-memory.dmp	family_overlord

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-939655444-3071939294-1401108526-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsUpdate_AYQh = "C:\\Users\\Admin\\AppData\\Local\\Microsoft\\Windows\\Explorer\\thumbcache_AYQhC9Vb\\ExplorerBroker.exe"	所得税の確定申告に係る納税通知書3.exe

Looks up external IP address via web service 1 TTPs 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

discovery

Internet Connection Discovery

T1016.001

flow	ioc
17	api.ipify.org
18	api.ipify.org
34	api.ipify.org

Executes dropped EXE 1 IoCs

pid	Process
5116	ExplorerBroker.exe

Loads dropped DLL 1 IoCs

pid	Process
5116	ExplorerBroker.exe

Checks processor information in registry 2 TTPs 4 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	RuntimeBroker.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	RuntimeBroker.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RuntimeBroker.exe

Modifies Control Panel 2 IoCs

defense_evasion

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\Accessibility\Blind Access\On = "1"	所得税の確定申告に係る納税通知書3.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\Accessibility\Blind Access\On = "1"	ExplorerBroker.exe

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Deployment\Package\*\S-1-5-21-939655444-3071939294-1401108526-1000\{73F78F51-9DD6-41F1-930E-9C791FE1182A}	RuntimeBroker.exe
Key created	\REGISTRY\MACHINE\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Deployment\Package\*\S-1-5-21-939655444-3071939294-1401108526-1000\{08274B92-7C4F-455A-BE1B-B14B7E5D377A}	RuntimeBroker.exe
Key created	\REGISTRY\MACHINE\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Deployment\Package\*\S-1-5-21-939655444-3071939294-1401108526-1000\{006E308B-B10F-4682-A790-1034347FF524}	RuntimeBroker.exe
Key created	\REGISTRY\MACHINE\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Deployment\Package\*\S-1-5-21-939655444-3071939294-1401108526-1000\{E92845E6-03B1-4B24-8BC1-6B81E5B66D50}	RuntimeBroker.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4756	所得税の確定申告に係る納税通知書3.exe
4756	所得税の確定申告に係る納税通知書3.exe
4756	所得税の確定申告に係る納税通知書3.exe
4756	所得税の確定申告に係る納税通知書3.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4756 wrote to memory of 4680	4756	所得税の確定申告に係る納税通知書3.exe	90
PID 4756 wrote to memory of 4680	4756	所得税の確定申告に係る納税通知書3.exe	90
PID 5116 wrote to memory of 4764	5116	ExplorerBroker.exe	95
PID 5116 wrote to memory of 4764	5116	ExplorerBroker.exe	95

C:\Users\Admin\AppData\Local\Temp\所得税の確定申告に係る納税通知書3.exe
"C:\Users\Admin\AppData\Local\Temp\所得税の確定申告に係る納税通知書3.exe"
1⤵
- Adds Run key to start application
- Modifies Control Panel
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4756
- C:\Windows\system32\RuntimeBroker.exe
  "C:\Windows\system32\RuntimeBroker.exe"
  2⤵
  - Checks processor information in registry
  - Modifies registry class
  PID:4680

C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_AYQhC9Vb\ExplorerBroker.exe
C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_AYQhC9Vb\ExplorerBroker.exe
1⤵
- Executes dropped EXE
- Loads dropped DLL
- Modifies Control Panel
- Suspicious use of WriteProcessMemory
PID:5116
- C:\Windows\system32\RuntimeBroker.exe
  "C:\Windows\system32\RuntimeBroker.exe"
  2⤵
  - Checks processor information in registry
  - Modifies registry class
  PID:4764

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

EVENT.dll

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_AYQhC9Vb\EVENT.dll
Size 52KB
SHA256 3302bd70c6117a0c16f0eb0aedef2ff0a2d02729e235cd8b6db7096d7bcb3406
MD5 ae41d87d6322a44e0b4afc1f3931ff5c
SHA1 992e88baf4ca093da0d9c0fe0fe07a4da6683ba2
SHA512 a9257383bbf1bb58c286e1c79da637156979f33693b443040465c5497f154a10e461b67f0205e6ccdccc96cb62531879548567c0b2fd43c22e9cf1ab52626717
SSDEEP 1536:behFdZT5cuB2uMbpYttdjKYzTuVC72MF:bEF7T5cY25NYt+MF
TLSH
T1143329429A8228E9C425C17542166723E9B2B858977079EF07F4CF2A7EA1FD0373C7D6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

ExplorerBroker.exe

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_AYQhC9Vb\ExplorerBroker.exe
Size 250KB
SHA256 abcb44b459e9f101106251bb9b4b7a07163554af450d0e61636417d12499cf2f
MD5 aeb22262cc2114f611c92eb062b34da3
SHA1 0bacc5bfbfeac8bade04d085e995d8c7f31c5f7c
SHA512 46fe4d42aacdc0ad9a3da270238ea982bed1af30478e5cdddce7fea8e04d49d0eb6db1c6275bc4eae5677c4b0bd371864eb1191ff6d4af9dbf507771469c9215
SSDEEP 6144:fK3jQoHr3VF2mjkaRGP4PkhijsKgW3UMKYMKBbZixsN:fKEoJF2mjkabsKgW3/m8
TLSH
T13044A11237F810D5F1B69679AAB58512E7B2BC662B25C7CF1260016E9F73BD0AC34732
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

settings.dat

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_AYQhC9Vb\settings.dat
Size 7.1MB
SHA256 d1ae5d193ea7530ee3718f5f4661228f739da8b250f478efd50d6c2a29a21580
MD5 1dc3a2159a5acce2f19addcab76bd7e4
SHA1 5d4de2272742d8aa90da105d2cfc173c9e4dc8c4
SHA512 a4fcfae1cc8f791885d6dbe9e8bbbfb5c08c5828356c8c9e9555142ea0aec51a2b26e2030c0ffbd6be7115f6f7a9df324214858cc41c31de323f333cba3f3109
SSDEEP 196608:oWjkFJSKr8iYN52W8Xvdxa7QovSGFTVNvSi4Im+vVViT:o5FJSKr7c4WKvdY7QmVVpSt8dY
TLSH
T10A76334E631D88B860DBC530D801D17B2C4CF63756BF8B1A80ADFE77D10A8B36566B5A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4680-9-0x00000254A4AA0000-0x00000254A51C3000-memory.dmp

Download

memory/4680-11-0x00000254A8880000-0x00000254ABBF7000-memory.dmp

Download

memory/4764-19-0x000001C198080000-0x000001C19B3F7000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads