masslogger | ea0a4c4e4ab8b6a483c5bdb3a73cd0ac90b3b0657fecf22829d4d91f1088d8ff

Analysis

max time kernel
87s
max time network
88s
platform
windows7_x64
resource
win7-20220414-en
submitted
21/05/2022, 12:13

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General

Target

OUR_NEW_.exe
Size

757KB
MD5

5eecffe3b62b1e5c080028e6c489cc98
SHA1

3fa94eff0cffe3fcad56d7e7b3dbcbac341211b5
SHA256

571ab77f2e5d3069e9b1974cd7548dd28f4cef875b33698b42a846b6057a476e
SHA512

eb79550f367005386cfc94a674a4c735484df3ff35f038401d5f7995bd0a01eb79d81be3c7b1f4c4b4c6a69dde0a5c28a3e81cd038efc843004310cd2d989cb5

Score

10^/10

masslogger ransomware rezer0 spyware stealer

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\AEF946DCB4\Log.txt

Family

masslogger

Ransom Note

################################################################# MassLogger v1.3.4.0 ################################################################# ### Logger Details ### User Name: Admin IP: 127.0.0.1 Location: United States OS: Microsoft Windows 7 Ultimate 64bit CPU: Intel Core Processor (Broadwell) GPU: Standard VGA Graphics Adapter AV: NA Screen Resolution: 1280x720 Current Time: 5/21/2022 2:26:08 PM MassLogger Started: 5/21/2022 2:25:52 PM Interval: 96 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\OUR_NEW_.exe MassLogger Melt: false MassLogger Exit after delivery: false As Administrator: True Processes:

Signatures

MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
stealer spyware masslogger

MassLogger Main Payload 33 IoCs

resource	yara_rule
behavioral1/memory/852-60-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-61-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-62-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-63-0x00000000004ABEAE-mapping.dmp	family_masslogger
behavioral1/memory/852-65-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-67-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-69-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-71-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-73-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-75-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-77-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-79-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-81-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-83-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-85-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-87-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-89-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-91-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-93-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-95-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-97-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-99-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-101-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-103-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-105-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-107-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-109-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-111-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-113-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-115-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-117-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-119-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger
behavioral1/memory/852-121-0x0000000000400000-0x00000000004B0000-memory.dmp	family_masslogger

MassLogger log file 1 IoCs

Detects a log file produced by MassLogger.

yara_rule
masslogger_log_file

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

resource	yara_rule
behavioral1/memory/2012-56-0x0000000004E70000-0x0000000004F28000-memory.dmp	rezer0

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Control Panel\International\Geo\Nation	OUR_NEW_.exe

Looks up external IP address via web service 1 IoCs

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

flow	ioc
4	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2012 set thread context of 852	2012	OUR_NEW_.exe	28

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
852	OUR_NEW_.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	852	OUR_NEW_.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28
PID 2012 wrote to memory of 852	2012	OUR_NEW_.exe	28

C:\Users\Admin\AppData\Local\Temp\OUR_NEW_.exe
"C:\Users\Admin\AppData\Local\Temp\OUR_NEW_.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2012
- C:\Users\Admin\AppData\Local\Temp\OUR_NEW_.exe
  "C:\Users\Admin\AppData\Local\Temp\OUR_NEW_.exe"
  2⤵
  - Checks computer location settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:852

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/852-87-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-75-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-578-0x0000000004655000-0x0000000004666000-memory.dmp

Filesize
68KB

Download
memory/852-57-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-58-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-60-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-61-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-62-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-65-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-67-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-69-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-71-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-73-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-85-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-77-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-79-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-81-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-576-0x0000000002160000-0x00000000021A4000-memory.dmp

Filesize
272KB

Download
memory/852-83-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-97-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-89-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-91-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-93-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-95-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-121-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-99-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-101-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-103-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-105-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-107-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-109-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-111-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-113-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-115-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-117-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/852-119-0x0000000000400000-0x00000000004B0000-memory.dmp

Filesize
704KB

Download
memory/2012-54-0x0000000000040000-0x0000000000104000-memory.dmp

Filesize
784KB

Download
memory/2012-55-0x0000000000520000-0x0000000000528000-memory.dmp

Filesize
32KB

Download
memory/2012-56-0x0000000004E70000-0x0000000004F28000-memory.dmp

Filesize
736KB

Download