buer | hxxps://docs[.]google[.]com/document/d/e/2PACX-1vTUh2dspNAMu0_rmKue5u4q84lPLQWmbmjXBluwEMUu3m7OT2WO5jev9uMdGDpP1LCaYJu2YJhfu3Pq/pub

Analysis

max time kernel
119s
max time network
128s
platform
windows10_x64
resource
win10v200722
submitted
22-09-2020 20:14

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General

Target

https://docs.google.com/document/d/e/2PACX-1vTUh2dspNAMu0_rmKue5u4q84lPLQWmbmjXBluwEMUu3m7OT2WO5jev9uMdGDpP1LCaYJu2YJhfu3Pq/pub

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

https://104.248.83.13/

Signatures

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

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/3712-14-0x00000000004C0000-0x00000000004CF000-memory.dmp	buer
behavioral1/memory/3712-15-0x0000000040000000-0x000000004000C000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
3712	Review.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)	\??\B:	Review.exe
File opened (read-only)	\??\K:	Review.exe
File opened (read-only)	\??\S:	Review.exe
File opened (read-only)	\??\W:	Review.exe
File opened (read-only)	\??\X:	Review.exe
File opened (read-only)	\??\A:	Review.exe
File opened (read-only)	\??\E:	Review.exe
File opened (read-only)	\??\J:	Review.exe
File opened (read-only)	\??\Q:	Review.exe
File opened (read-only)	\??\T:	Review.exe
File opened (read-only)	\??\H:	Review.exe
File opened (read-only)	\??\P:	Review.exe
File opened (read-only)	\??\U:	Review.exe
File opened (read-only)	\??\Z:	Review.exe
File opened (read-only)	\??\N:	Review.exe
File opened (read-only)	\??\O:	Review.exe
File opened (read-only)	\??\R:	Review.exe
File opened (read-only)	\??\F:	Review.exe
File opened (read-only)	\??\G:	Review.exe
File opened (read-only)	\??\I:	Review.exe
File opened (read-only)	\??\L:	Review.exe
File opened (read-only)	\??\M:	Review.exe
File opened (read-only)	\??\V:	Review.exe
File opened (read-only)	\??\Y:	Review.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Modifies Internet Explorer Phishing Filter 1 TTPs 2 IoCs

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\PhishingFilter	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\PhishingFilter\ClientSupported_MigrationTime = ac580a505b60d601	iexplore.exe

Modifies Internet Explorer settings 1 TTPs 55 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "30839069"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NTPFirstRun = "1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "2629351677"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "30839069"	IEXPLORE.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$WordPress	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{C553A72D-FD10-11EA-BEC3-76B046606B1C} = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastUpdateLowDateTime = "2582006696"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb010000007a3f68aebec9774fa8831fc57bb96e6c00000000020000000000106600000001000020000000ef38e11a097dcfd1907076ca6fd31312bc6cdf08db05369572fe13ecb95bb226000000000e80000000020000200000007ae47df3a7562c3d3df2bc549e05dafe73e8e1cb2a5fcf258e59b5d8e754e55320000000d3deb460a07e3f6e9989df6ea587bd556ead2196290d46280a8764b71a43299a400000004594fb502d7555e860a9566dacb2db4aa398c687de65a3e32abd3fab15742258d39888463a71ca14c94a262c548f0635ae835c3a2d1b78f7d57a5476897d0755	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "2582006696"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = 00304e9b1d91d601	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$http://www.typepad.com/	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager	IEXPLORE.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\en-US = "en-US.1"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$blogger	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$Discuz!	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastTTLLowDateTime = "1251635200"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = f0cc579b1d91d601	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$Telligent	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "2591382932"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\DomainSuggestion	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	IEXPLORE.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastUpdateHighDateTime = "30839069"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$MediaWiki	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$vBulletin 4	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\RepId	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "30839069"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "307570881"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\HistoryJournalCertificate	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\FileVersion = "2016061511"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\NextUpdateDate = "307619466"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\HistoryJournalCertificate\NextUpdateDate = "307587475"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb010000007a3f68aebec9774fa8831fc57bb96e6c000000000200000000001066000000010000200000003263e86ac640c6fcf28873d340e5b0c295961d9383b8f9784e1409494110b9c6000000000e80000000020000200000007f00fe58623071b0e836d008659c1e129f16228aa33c753645c78d48959b27bc2000000020ed927937de10727779951a72fa280710089a1463f4c7141e14a8788fe81ffe4000000097fc8f320b9fdad5662742db7b03a55870aa3e25d194e5958afe9d7441d35ce3973b4173137249c4c7d7a03daf08aedab4c2a9e45a6b8aae6d0e518958831f91	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\FlipAhead\Meta\generator$vBulletin 3	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\RepId\PublicId = "{51EFF5A2-A7DD-41A9-82C9-C5FFBE2CDD8B}"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2168186643-810464528-1121082739-1000\Software\Microsoft\Internet Explorer\VersionManager\LastTTLHighDateTime = "50"	iexplore.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
3796	powershell.exe
3796	powershell.exe
3796	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3796	powershell.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
2224	iexplore.exe
2224	iexplore.exe

Suspicious use of SetWindowsHookEx 8 IoCs

pid	Process
2224	iexplore.exe
2224	iexplore.exe
1640	IEXPLORE.EXE
1640	IEXPLORE.EXE
4008	IEXPLORE.EXE
4008	IEXPLORE.EXE
4008	IEXPLORE.EXE
4008	IEXPLORE.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2224 wrote to memory of 1640	2224	iexplore.exe	71
PID 2224 wrote to memory of 1640	2224	iexplore.exe	71
PID 2224 wrote to memory of 1640	2224	iexplore.exe	71
PID 2224 wrote to memory of 4008	2224	iexplore.exe	73
PID 2224 wrote to memory of 4008	2224	iexplore.exe	73
PID 2224 wrote to memory of 4008	2224	iexplore.exe	73
PID 2224 wrote to memory of 3712	2224	iexplore.exe	76
PID 2224 wrote to memory of 3712	2224	iexplore.exe	76
PID 2224 wrote to memory of 3712	2224	iexplore.exe	76
PID 3712 wrote to memory of 3796	3712	Review.exe	79
PID 3712 wrote to memory of 3796	3712	Review.exe	79
PID 3712 wrote to memory of 3796	3712	Review.exe	79

C:\Program Files\Internet Explorer\iexplore.exe
"C:\Program Files\Internet Explorer\iexplore.exe" https://docs.google.com/document/d/e/2PACX-1vTUh2dspNAMu0_rmKue5u4q84lPLQWmbmjXBluwEMUu3m7OT2WO5jev9uMdGDpP1LCaYJu2YJhfu3Pq/pub
1⤵
- Modifies Internet Explorer Phishing Filter
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2224
- C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
  "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:2224 CREDAT:82945 /prefetch:2
  2⤵
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:1640
- C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
  "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:2224 CREDAT:148482 /prefetch:2
  2⤵
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:4008
- C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\1T2VX7QX\Review.exe
  "C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\1T2VX7QX\Review.exe"
  2⤵
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious use of WriteProcessMemory
  PID:3712
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\3514aac447cbec758ccc}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3796

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Web Service

T1102

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3712-14-0x00000000004C0000-0x00000000004CF000-memory.dmp

Filesize
60KB

Download
memory/3712-15-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3796-19-0x000000006E1E0000-0x000000006E8CE000-memory.dmp

Filesize
6.9MB

Download
memory/3796-20-0x00000000073B0000-0x00000000073B1000-memory.dmp

Filesize
4KB

Download
memory/3796-21-0x0000000007AF0000-0x0000000007AF1000-memory.dmp

Filesize
4KB

Download
memory/3796-22-0x0000000007AC0000-0x0000000007AC1000-memory.dmp

Filesize
4KB

Download
memory/3796-23-0x0000000008370000-0x0000000008371000-memory.dmp

Filesize
4KB

Download
memory/3796-24-0x0000000008450000-0x0000000008451000-memory.dmp

Filesize
4KB

Download
memory/3796-25-0x00000000084C0000-0x00000000084C1000-memory.dmp

Filesize
4KB

Download
memory/3796-26-0x0000000008300000-0x0000000008301000-memory.dmp

Filesize
4KB

Download
memory/3796-27-0x0000000008C40000-0x0000000008C41000-memory.dmp

Filesize
4KB

Download
memory/3796-28-0x0000000008B50000-0x0000000008B51000-memory.dmp

Filesize
4KB

Download
memory/3796-30-0x0000000009920000-0x0000000009953000-memory.dmp

Filesize
204KB

Download
memory/3796-37-0x0000000009900000-0x0000000009901000-memory.dmp

Filesize
4KB

Download
memory/3796-38-0x0000000009A70000-0x0000000009A71000-memory.dmp

Filesize
4KB

Download
memory/3796-39-0x0000000009E40000-0x0000000009E41000-memory.dmp

Filesize
4KB

Download
memory/3796-40-0x0000000009DE0000-0x0000000009DE1000-memory.dmp

Filesize
4KB

Download
memory/3796-42-0x0000000009DD0000-0x0000000009DD1000-memory.dmp

Filesize
4KB

Download